Awesome SAP Clean Core & ABAP Cloud

A curated list of production-grade SAP Clean Core, ABAP Cloud, BTP Extensibility, and S/4HANA migration frameworks, open-source libraries, interactive tools, and architectural guides.

Contents

• Official Standards & Specifications
• Open-Source Frameworks & Libraries
• Interactive Developer Tools
• Technical Cheat Sheets & Quick References
• Enterprise Books & Reference Guides
• Contributing
• SAP Released API & Obsolete FM Replacement Finder - Instant modern ABAP Cloud released class replacements and snippets for obsolete function modules (NUMBER_GET_NEXT, SO_NEW_DOCUMENT, BAPI).
• SAP CDS View Entity Modernizer & Cleaner - Converts classic SAP CDS Views (define view with sqlViewName) to modern ABAP Cloud compliant CDS View Entities.
• SAP Custom Code Decommissioning & Retirement Calculator - Quantifies savings and hours avoided by decommissioning unused legacy ABAP objects.
• SAP BTP Destination & Cloud SDK Generator - Generates enterprise BTP destination configurations and Cloud SDK consumption snippets.
• ABAP Cloud Unit Test & Test Double Generator - Generates ABAP Unit test classes, cl_cds_test_environment fixtures, and cl_abap_testdouble mocks.
• SAP RAP Service Definition & OData V4 Binding Generator - Generates RAP Service Definitions, Projection CDS Views, and OData V4 bindings.

Official Standards & Specifications

• SAP Clean Core Strategy Guide - Official principles for cloud-compliant enterprise ERP governance.
• ABAP Cloud Development Model - Modern ABAP language version specification, C1 release contracts, and RAP transactional engine.
• ATC Check Variant ABAP_CLEAN_CORE_DEVELOPMENT - SAP's official code inspector check variant enforcing Clean Core rules, Tier-1/Tier-2 classification, and obsolete syntax detection.
• SAP Business Technology Platform (BTP) Developer Guide - Event-Driven Architecture, SAP Event Mesh, Cloud Application Programming (CAP), and side-by-side extensibility.

Open-Source Frameworks & Libraries

• CleanCoreABAP - Production-ready repository featuring Tier-2 quarantine wrappers, RAP event handlers, and Clean Core migration templates.
• ROSA (RAP OData Schema Analyzer) - Lightweight schema and behavior definition validator for SAP RESTful Application Programming model (RAP) services.
• abap-cloud-logger - Enterprise-grade logging library fully compliant with Language Version ABAP Cloud and S/4HANA Cloud Public Edition.
• abapGit - The definitive Git client for ABAP, enabling GitOps, continuous integration, and version control for SAP development.
• clean-core.io - Community pattern repository and reference architecture catalog for Clean Core engineering.

Interactive Developer Tools

• ABAP Cloud Code Inspector & Compliance Scorer - Free in-browser client-side code auditor. Detects obsolete TABLES:, CALL FUNCTION, raw SQL on standard tables, and returns clean modern replacements.
• 📈 Tool #108: S/4HANA EPPM & Project System Architect - Modernize CJ20N/PROJ systems, model WBS elements via RAP EML (I_EnterpriseProjectTP), budget AVAC, and real-time ACDOCA settlement.
• 🛡️ Tool #107: S/4HANA EHS Clean Core Architect - Incident Management RAP modeling, OSHA 300/301 regulatory compliance, clean core BAdIs, and chemical safety workflows.
• 🔬 Tool #106: S/4HANA Quality Management (QM) Architect - Inspection Lot QALS RAP modeling, automated Usage Decision (UD) engines, clean core QM BAdIs, and 8D defect resolution workflows.
• 🛠️ Tool #105: S/4HANA Plant Maintenance & Asset Architect - Modernize IW31/IW32 procedural code, configure the 9-step Phase Model, clean core EAM BAdIs, and mobile technician execution.
• 🚢 Tool #104: S/4HANA TM Clean Core Architect - Sunset LE-TRA shipments, model Freight Orders (/SCMTMS/TOR), carrier collaboration APIs, and automated ACDOCA freight settlement.
• 🚛 Tool #103: S/4HANA EWM Clean Core Architect - Embedded vs Decentralized sizing, retire LE-WM debt, clean core Warehouse Task BAdIs, and RF mobile modernization.
• 📊 S/4HANA Group Reporting & Consolidation Architect - Model Consolidation Journal (ACDOCU), real-time release from Universal Journal (ACDOCA), ICMR continuous matching, and consolidation BAdIs.
• 🖨️ S/4HANA Output Management & BRFplus Architect - Retire NAST debt, configure S/4HANA Output Control (OPD) decision tables, ADS print queues, and BAdI parameter hooks.
• 🏆 Tool #100: SAP Clean Core Master Suite & Assessment Cockpit - Full 5-pillar enterprise maturity evaluation, architecture manifest generator (YAML/JSON/Mermaid), and S/4HANA roadmap planner.
• SAP S/4HANA Settlement Management & Condition Contracts Architect - Condition Contracts (WCOCO) & rebate accruals.
• SAP S/4HANA advanced ATP (aATP) & Allocation Architect - Product Allocation (PAL) & BOP variants.
• SAP S/4HANA Flexible Workflow & BAdI Architect - Agent determination BAdIs & Task Center.
• SAP HANA Native Storage Extension (NSE) & Data Tiering Architect - Page-loadable column store & buffer cache.
• SAP S/4HANA Parallel Currency & Multi-GAAP Architect - Universal Journal parallel currency types & CDS conversions.
• SAP S/4HANA Migration Cockpit & LTMOM Architect - Staging tables & cutover transformation rules.
• SAP Clean Core Multilingual & Translation Architect - CDS Text Entities & SAP Translation Hub.
• SAP BTP Work Zone & Fiori Launchpad CDM Architect - SAP Build Work Zone & CDM 3.0 content federation.
• SAP S/4HANA Finance Custom Coding Block & Extension Ledger Architect - Universal Journal (ACDOCA) & Extension Ledgers.
• SAP Clean Core ABAP Daemon & Background Worker Architect - Event-driven daemons, PCP messaging & auto-restart.
• SAP BTP Private Link & Hyperscaler Peering Architect - Zero-trust private network peering to Azure & AWS.
• SAP Clean Core Dead Letter Queue (DLQ) & Retry Architect - Exponential backoff retries and poison message quarantine.
• SAP Clean Core AsyncAPI & Event Schema Architect - Generate AsyncAPI 3.0 contracts and JSON schemas.
• SAP BTP Cloud Foundry to Kyma Migration Architect - Convert manifest.yml to Kubernetes Deployments & APIRules.
• SAP Clean Core Table Buffering & SQL Buffer Architect - Optimize Single-Record, Generic, and Full buffering in SAP S/4HANA.
• SAP BTP Document Information Extraction (DOX) & AI Architect - Generate custom schemas and ABAP Cloud DOX clients.
• SAP Clean Core Kafka & Event Mesh Architect - Bridge S/4HANA events to Apache Kafka & Confluent Cloud.
• SAP Clean Core Shared Memory (SHMA) & Buffer Architect - Generate ABAP Cloud Shared Memory root classes and locking handles.
• SAP Clean Core API Rate Limiting & Throttling Architect - Generate ABAP Cloud Token Bucket limiters and APIM policies.
• SAP BTP Kyma & Cloud-Native Runtime Architect - Generate Kubernetes manifests, Serverless Functions, and Istio APIRules.
• SAP Clean Core CI/CD & Automated ATC Quality Gate Architect - Generate automated pipelines enforcing remote ATC checks and ABAP Unit coverage.
• SAP CAP MTX Extensibility Project Builder - Configure subscriber-level CDS extensions with CAP MTXS on BTP.
• SAP Clean Core Secret Management & Credential Store Architect - Design zero-trust secrets management with BTP Credential Store.
• SAP Clean Core Real-Time WebSocket & Push Architect - Eliminate polling with real-time WebSocket and SSE push gateways.
• SAP Clean Core Circuit Breaker & Fault Tolerance Architect - Prevent cascading outages with circuit breakers, bulkheads, and retries.
• SAP Clean Core Audit Trail & Compliance Logging Architect - Design immutable audit trails, BALI logs, and BTP Audit Log API handlers.
• SAP Clean Core OpenTelemetry & Distributed Tracing Architect - Unify end-to-end tracing between S/4HANA and BTP with W3C traceparent headers.
• SAP Clean Core Zero-Downtime Blue-Green Architect - Design zero-downtime blue-green deployments and Expand-and-Contract schemas.
• SAP Clean Core Semantic Data Mesh & BOI Architect - Design enterprise Semantic Data Mesh domains and C1 released Business Object Interfaces.
• SAP Clean Core Distributed Sagas & Compensation Architect - Coordinate cross-system transactions without distributed locks using Sagas.
• SAP BTP Multi-Tenant SaaS Extension Architect - Design enterprise multi-tenancy on SAP BTP with SaaS Registry and CAP MTXS.
• SAP Build Process Automation (SPA) & Workflow Architect - Architect side-by-side workflows with SAP Build Process Automation on BTP.
• SAP Clean Core ILM & Data Retention Architect - Architect enterprise Information Lifecycle Management (ILM), GDPR compliance, and legal holds in S/4HANA.
• SAP Clean Core OAuth2 mTLS & Zero-Trust Architect - Architect enterprise Zero-Trust security for SAP S/4HANA Clean Core with X.509 mTLS and OAuth2 token exchange.
• SAP BTP Redis Distributed Cache & Lock Architect - Architect distributed caching, Redlock mutual exclusion, and rate limiting with SAP BTP Redis.
• SAP Integration Advisor (MIG/MAG) & B2B Architect - Design B2B interfaces with SAP Integration Advisor, MIGs, MAGs, and automated XSLT artifacts.
• SAP BTP GraphQL & Apollo Federation Architect - Design enterprise Apollo Federation subgraphs and unified GraphQL gateways on SAP BTP to federate S/4HANA OData V4 services.
• SAP Clean Core CDS Performance Profiler & SQL Optimizer - Diagnose and optimize SAP HANA CDS Views, eliminate row-engine fallbacks, and push down calculations.
• SAP Clean Core CDC & Delta Extraction Architect - Design Change Data Capture (CDC) architectures with CDS delta annotations (@Analytics.dataExtraction), ODP queues, and OData V4 delta links.
• SAP BTP Advanced Event Mesh (AEM) Architect - Design enterprise-grade event architectures with Solace/AEM, topic taxonomies, SEMP v2 automated broker configs, and RAP CloudEvents bindings.
• SAP Clean Core RAP BDEF Extension Architect - Architect upgrade-stable Behavior Definition Extensions on standard SAP BOs with custom validations, determinations, and actions.
• SAP Clean Core ATC QuickFix & Modernizer - Generate automated ABAP Test Cockpit QuickFixes (cl_ci_quickfix) and AST refactoring rules for Eclipse ADT.
• SAP Clean Core OData Client Proxy Architect - Generate type-safe OData V2/V4 consumers in ABAP Cloud with BTP destination binding and filter builders.
• SAP Clean Core IDoc to API & Event Modernizer - Modernize legacy SAP IDocs/EDI into clean core REST APIs, RAP EML mutators, and CloudEvents.
• SAP S/4HANA Output Management & Adobe Forms Architect - Replace NAST with BRFplus Output Parameter Determination, BTP Forms by Adobe rendering, and ABAP Cloud email dispatchers.
• SAP Universal Journal (ACDOCA) & Clean Core Finance Architect - Architect financial extensions with FINS_ACDOC_POSTING_EXTENSION, CDS view extensions, and RAP EML posting services.
• SAP Clean Core Parallel Processing Architect - Architect concurrent batch worker pools with cl_abap_parallel, cursor chunking, and lock-free result aggregation.
• SAP Clean Core Application Log (cl_bali_log) Architect - Generate ABAP Cloud BALI logging wrappers, exception callstack tracers, and RAP save sequence adapters.
• SAP RAP Mass Operations & Action Parameter Architect - Architect multi-record Fiori actions, abstract parameter dialogs, and automatic UI Side Effects.
• SAP S/4HANA CVI & Business Partner Architect - Architect Customer-Vendor Integration (CVI) with direction mappings, custom field BAdI extensions, and RAP EML mutators.
• SAP OData $batch & Atomic ChangeSet Orchestrator - Architect enterprise atomic OData $batch requests and ChangeSets with multipart/mixed payloads and Content-ID references.
• SAP RAP Augmentation & Pre-Check Architect - Extend SAP standard business objects cleanly with BDEF extension augmentations, pre-check validation routines, and %augmented handlers.
• SAP RAP Concurrency & Draft Lock Architect - Architect lock master/dependent BDEF hierarchies, Total ETag annotations, and optimistic concurrency controls in SAP RAP.
• SAP Zero-Downtime Table Migration Architect - Architect high-volume custom table migrations with shadow table DDL, chunked cursor extractors, and delta replay engines.
• SAP CDS Virtual Elements & SADL Calculation Architect - Architect CDS virtual elements with @ObjectModel.virtualElement, IF_SADL_EXIT_CALC_ELEMENT_READ classes, and unit test doubles.
• SAP Clean Core DMS & CMIS Attachment Architect - Architect BTP Document Management Service (DMS) storage, RAP Large Object CDS views, and ABAP Cloud stream clients.
• SAP BTP MTA & Approuter Architect - Architect Cloud Foundry Multi-Target Applications with mta.yaml, xs-app.json routing, xs-security.json, and CI/CD pipelines.
• SAP ABAP Cloud IAM & Business Catalog Architect - Architect Clean Core IAM artifacts with IAM App descriptors, Business Catalogs, and RAP behavior pool authorization checks.
• SAP BTP Kyma & Serverless Extension Architect - Architect Kubernetes side-by-side extensions in Kyma with Serverless Functions, Istio APIRules, Eventing Subscriptions, and BTP Service Bindings.
• SAP BTP Principal Propagation & Identity Architect - Architect end-to-end identity flow and SSO between BTP, Cloud Connector, and S/4HANA backend with X.509 cert rules, CERTRULE mapping, and BTP Destinations.
• SAP Clean Core gCTS & CI/CD Pipeline Architect - Design Git-enabled CTS (gCTS) repos, multi-branching strategies, and automated GitLab CI/GitHub Actions workflows with ATC and ABAP Unit gates.
• SAP Event Mesh Topic Taxonomy & Queue Matrix Architect - Architect hierarchical CloudEvent topic taxonomies, wildcard queue subscriptions, and Dead-Letter Queue (DLQ) configs for Event Mesh and Advanced Event Mesh.
• SAP Custom Code Migration & Package Hierarchy Architect - Classify custom objects across Clean Core Tier-1, Tier-2, Decommission, and Quick Fix. Architect ADT package hierarchies and scoping runbooks.
• SAP RAP Business Event Consumer & Receiver Generator - Ingest CloudEvents from Event Mesh or Kafka idempotently. Generate HTTP webhook receivers, RAP EML (MODIFY ENTITIES) callers, and audit tables.
• SAP RAP Transactional Outbox & Event Queue Generator - Prevent dual-write hazards between SAP HANA and SAP Event Mesh. Generate atomic Outbox tables, RAP save_modified enqueue logic, and Application Job dispatchers.
• SAP Change Document & Audit Trail Generator - Generate Clean Core audit logging logic using modern CL_CHDO_WRITE_TOOLS and CL_CHDO_READ_TOOLS for SAP RAP save_modified routines.
• SAP RAP Custom Query & Unmanaged Query Provider Generator - Generate production-ready Custom Entities and IF_RAP_QUERY_PROVIDER classes with $filter ranges, $top/$skip paging, and BTP REST / Tier-2 RFC integration.
• SAP Business Object Interface (BOI) & C1 Contract Generator - Architect contract-based public APIs in S/4HANA. Generate RAP Business Object Interfaces (ZI_*) and C1 release contract metadata.
• SAP Feature Flag & Cutover Switch Generator - Eliminate big-bang cutover risk. Generate ABAP Cloud Feature Flag engines, canary switches, and Strangler Fig branching logic.
• SAP ATC Custom Exemption & Baseline Engine - Manage Clean Core quality gates and transport release blockers under ATC variant ABAP_CLEAN_CORE_DEVELOPMENT. Generate formal Exemption Requests and Baseline configs.
• SAP BTP Cloud Connector & Destination Architect - Scaffold hybrid connectivity: Cloud Connector reverse-invoke mappings, BTP Destination configurations (Principal Propagation), and Cloud SDK code.
• SAP RAP Draft Housekeeping & Cleanup Daemon - Safely identify and purge abandoned RAP draft instances and stale enqueue locks via cl_apj_rt_api and modern EML DISCARD DRAFT.
• SAP CDS Analytical Cube & Dimension Query Builder - Generate compliant S/4HANA Analytical VDM models: #CUBE, #DIMENSION, and @Analytics.query: true for SAC and Fiori.
• SAP Application Job & Background Scheduler - Replace obsolete SM36, JOB_OPEN, and executable reports with ABAP Cloud cl_apj_rt_api and if_apj_rt_exec_object.
• SAP Number Range & Sequence Generator - Replace obsolete NUMBER_GET_NEXT with ABAP Cloud cl_numberrange_runtime. Generates number intervals, ADT setup runners, and RAP determinations.
• SAP Key-User In-App Extensibility Logic Builder - Generates compliant Key-User Custom Fields (YY1_*), Business Context extensions, and Restricted ABAP logic.
• SAP Custom Code Remediation & Effort Estimator - Quantifies custom ABAP remediation person-days, consulting budget, and automation savings across Classes, Reports, and Exits.
• SAP RAP Architecture Decision Wizard - Evaluates 5 architectural criteria to determine whether your BO should be Pure Managed, Managed with Unmanaged Save, or Draft-enabled.
• SAP CDS Access Control & DCL Generator - Converts imperative AUTHORITY-CHECK statements into declarative CDS DCL define role definitions with aspect pfcg_auth.
• SAP Clean Core Migration Readiness Assessment - Self-assess your SAP landscape across 8 architectural dimensions. Calculate your S/4HANA Cloud Readiness Score (0-100%).
• SAP BTP CAP Service & Schema Generator - Scaffolds production Cloud Application Programming Model (CAP) Node.js services, CDS models, and Cloud SDK handlers for Tier-3.
• SAP CDS Hierarchy & Tree Builder - Generates SQL-standard parent-child hierarchies (define hierarchy), recursive ABAP Cloud queries, and Fiori TreeTable projection views.
• SAP OData V2 to V4 Migration Assistant - Converts legacy Gateway V2 query parameters, substring filters, and nested expands to modern RAP OData V4 format.
• Tier-2 Quarantine Wrapper Generator - Free online tool to automatically generate C1-released interfaces, isolated wrapper classes, and Tier-1 ABAP Cloud consumption code.
• RAP Behavior Definition (BDEF) & EML Syntax Generator - Generates production-ready RAP Managed/Unmanaged BDEFs and Entity Manipulation Language (EML) statements.
• SAP RAP Service Definition & OData V4 Binding Generator - Generates production Service Definitions, Projection Views with Fiori annotations, and OData V4 Service Bindings.
• Developer Extensibility BAdI Implementation Generator - Produces compliant ABAP Cloud Developer Extensibility BAdI classes (IF_EX_*), filter evaluations, and clean exception isolation.
• Clean Core Maturity Framework Calculator - Official Clean Core Maturity Framework (Levels A–D) scoring and S/4HANA migration roadmap estimator.
• ABAP Cloud SQL & CDS Query Modernizer - Instant translation of legacy database accesses (VBAK, VBAP, BSEG) into modern released Core Data Services.
• SAP CDS View Entity Modernizer & Cleaner - Converts classic SAP CDS Views (define view with sqlViewName) to modern ABAP Cloud compliant CDS View Entities.
• 3-Tier Extensibility Decision Wizard & ADR Generator - Interactive decision matrix routing requirements to Tier 1, Tier 2, or Tier 3 with instant Architecture Decision Record (ADR) export.
• SAP ATC Error Lookup & Quick-Fixer - Instant lookup and resolution guides for check variant ABAP_CLEAN_CORE_DEVELOPMENT Priority 1 & 2 transport blockers.
• Clean Core 5-Year TCO & ROI Savings Calculator - Calculate technical debt reduction, upgrade regression testing savings, and export executive business cases.
• SAP Custom Code Decommissioning Calculator - Quantifies 5-year maintenance savings, technical debt elimination, and remediation hours avoided.
• SAP Event Mesh & RAP Business Event Generator - Generates RAP business event definitions in ABAP Cloud, CloudEvents 1.0 JSON payloads, and SAP BTP CAP event consumers.
• SAP Generative AI Hub & Vector Architect - Generates production Enterprise RAG blueprints: SAP HANA Cloud Vector DDL, cosine similarity search, and SAP Generative AI Hub API orchestration.
• SAP Released API & Obsolete FM Finder - Instant lookup for modern ABAP Cloud replacements for obsolete SAP function modules with production code snippets.
• SAP BTP Destination & Cloud SDK Generator - Generates enterprise BTP destination configurations, SAP Cloud SDK HTTP requests, and CAP connection logic.
• ABAP Cloud Unit Test & Test Double Generator - Generates compliant ABAP Unit test fixtures, cl_cds_test_environment mocks, and cl_abap_testdouble assertions.

Technical Cheat Sheets & Quick References

1. 🏆 Guide #95 Milestone: S/4HANA EPPM & Project System Architecture Guide - Modernizing SAP Project System (PS) with WBS RAP EML, budget availability control (AVAC), and real-time ACDOCA settlement.
2. 🛡️ Guide #94: S/4HANA EHS & Compliance Architecture Guide - Modernizing SAP EHS with Incident Management (I_EHSIncidentTP), OSHA 300 reporting, and Clean Core BAdIs.
3. 🔬 Guide #93: S/4HANA Quality Management Architecture Guide - Modernizing SAP QM with automated Usage Decisions, RAP Business Object I_InspectionLotTP, and Clean Core BAdIs.
4. 🛠️ Guide #92: S/4HANA Asset Management & Plant Maintenance Guide - Replacing legacy procedural user exits with the 9-step Phase Model, RAP EML MaintenanceOrder, and Clean Core BAdIs.
5. 🚢 Guide #91: S/4HANA Transportation Management (TM) Architecture Guide - Sunsetting LE-TRA shipments, Freight Order architecture, CloudEvents carrier collaboration, and freight settlement.
6. 🏆 Guide #90 Milestone: S/4HANA EWM Architecture Guide (Embedded vs Decentralized) - Strategic guide to S/4HANA EWM architecture, sunsetting legacy LE-WM, clean core Warehouse Task BAdIs, and RF mobile modernization.
7. 📊 Guide #89: S/4HANA Group Reporting Architecture Guide - Universal Journal integration (ACDOCU), real-time ICMR matching, currency translation, and clean core BAdIs.
8. 🖨️ Guide #88: S/4HANA Clean Core Output Management Guide - Step-by-step methodology for OPD BRFplus configuration, Adobe Document Services (ADS), and print queues.
9. 🏆 Guide #87: The Definitive SAP Clean Core Enterprise Architecture Blueprint - The 100-tool master architecture framework covering 5 Clean Core pillars, 3-tier extensibility, and BTP topology.
10. SAP S/4HANA Settlement Management, Condition Contracts (COCO) & Rebate Accruals Guide - Complete guide for S/4HANA settlement.
11. SAP S/4HANA advanced ATP (aATP), Product Allocation & Backorder Processing (BOP) Guide - Complete guide for S/4HANA supply chain.
12. SAP S/4HANA Flexible Workflow (SWF_FLEX), Custom BAdIs & My Inbox Clean Core Guide - Complete guide for S/4HANA approvals.
13. SAP Clean Core Data Tiering: SAP HANA Native Storage Extension (NSE), Aging & Cold Storage Guide - Complete guide for HANA memory optimization.
14. SAP S/4HANA Universal Journal Currency Architecture, Parallel Currencies & Multi-GAAP Guide - Complete guide for S/4HANA parallel accounting.
15. SAP S/4HANA Migration Cockpit (LTMOM), Staging Tables & Clean Core Data Migration Guide - Complete guide for S/4HANA data cutover.
16. SAP Clean Core Multilingual Architecture, CDS Text Entities & SAP Translation Hub Guide - Complete guide for enterprise localization.
17. SAP Build Work Zone, Fiori Launchpad & CDM Content Federation Architecture Guide - Complete guide for enterprise launchpad federation.
18. SAP S/4HANA Finance Coding Block, Extension Ledgers & ACDOCA Extensibility Guide - Complete guide for S/4HANA financial architecture.
19. SAP Clean Core ABAP Daemons, Long-Running Background Workers & PCP Messaging Guide - Complete guide for daemon architecture & lifecycle.
20. SAP BTP Private Link Service, Azure/AWS Direct Peering & Zero-Trust Connectivity Guide - Complete guide for zero-egress cloud networking.
21. SAP Clean Core Dead Letter Queues (DLQ), Exponential Backoff Retries & Poison Message Handling Guide - Complete guide for event resilience.
22. SAP Clean Core AsyncAPI Specifications & Event Schema Governance Guide - Complete guide for event contract governance.
23. SAP BTP Cloud Foundry to Kyma Runtime Migration Guide - Complete guide for migrating CF workloads to Kyma.
24. SAP Clean Core Table Buffering, Single-Record & Generic Buffer Guide - Complete guide for application server caching and DDLOG sync.
25. SAP BTP Document Information Extraction (DOX) & Business AI Processing Guide - Complete guide for intelligent document processing in SAP.
26. SAP Clean Core Enterprise Event-Driven Architecture: Event Mesh, Kafka & CloudEvents Guide - Complete guide for SAP-to-Kafka bridges.
27. SAP Clean Core Shared Memory (SHMA) & High-Performance In-Memory Caching Guide - Complete guide for cross-session caching in ABAP Cloud.
28. SAP Clean Core API Rate Limiting, Throttling & Resilient Traffic Management Guide - Complete guide for protecting SAP DIA work processes.
29. SAP BTP Kyma Runtime, Microservices & Serverless Architecture Guide - Complete guide for cloud-native side-by-side extensions.
30. SAP Clean Core CI/CD, Automated Regression & Quality Gates Guide - Complete DevSecOps guide for remote ATC gates and cTMS orchestration.
31. SAP BTP CAP MTX Multitenant Extensibility & Schema Guide - Production guide for subscriber CDS extensions and dynamic schema migrations.
32. SAP Clean Core Secrets Management & Credential Store Guide - Production guide for eliminating hardcoded credentials with BTP Credential Store & Vault.
33. SAP Clean Core Real-Time WebSockets & Push Notifications Guide - Production guide for eliminating polling loops with WebSockets, SSE & Event Mesh.
34. SAP Clean Core Circuit Breakers & Fault Tolerance Guide - Production guide for preventing cascading microservice outages across hybrid SAP topologies.
35. SAP Clean Core Audit Trail, Change Documents & Compliance Logging Guide - Production guide for immutable audit trails, BALI logging, and SOX/FDA compliance.
36. SAP Clean Core OpenTelemetry & Distributed Tracing Guide - Milestone guide for vendor-neutral tracing, W3C traceparent headers, and Cloud ALM.
37. SAP Clean Core Zero-Downtime Blue-Green Deployment Guide - Production guide for blue-green routing, Expand-and-Contract schemas, and canary cutovers.
38. SAP Clean Core Semantic Data Mesh & Business Object Interface Guide - Production guide for decentralized Semantic Data Mesh domains, C1 BOIs, and Datasphere.
39. SAP Clean Core Distributed Transactions & Sagas Pattern Guide - Production guide for distributed Sagas, compensating transactions, and transactional outbox.
40. SAP BTP Multi-Tenant SaaS & MTX Architecture Guide - Production guide for SAP BTP SaaS Registry, isolated HDI containers, and subscriber extensibility.
41. SAP Build Process Automation (SPA) & Clean Core Workflow Guide - Production guide for SAP Build Process Automation, CloudEvents triggers, and SWDD retirement.
42. SAP Clean Core ILM, GDPR Compliance & Data Privacy Guide - Production guide for SAP Information Lifecycle Management (ILM), retention rules, and GDPR erasure.
43. SAP Clean Core OAuth2 mTLS & Zero-Trust Security Guide - Production guide for Zero-Trust security in SAP S/4HANA Clean Core, mTLS certificates, and OAuth2 token exchange.
44. SAP BTP Redis Distributed Caching & Locking in Clean Core Guide - Production guide for SAP BTP Redis, Redlock concurrency, and idempotency key caching.
45. SAP Integration Advisor (MIG/MAG) & Clean Core B2B Guide - Production guide for SAP Integration Advisor, MIG/MAG design, and PO/PI migration.
46. SAP Clean Core GraphQL & Apollo Federation on BTP Guide - Milestone Guide #50: Architectural guide for GraphQL subgraphs and Apollo Federation on SAP BTP.
47. SAP Clean Core CDS Query Performance & SQL Plan Analysis Guide - Production guide for SAP HANA Core Data Services tuning and SQL Plan Visualizer.
48. SAP Clean Core CDS CDC & Real-Time Delta Replication Guide - Production guide for Change Data Capture (CDC) in SAP S/4HANA Clean Core with @Analytics.dataExtraction and ODP.
49. SAP Advanced Event Mesh (AEM) & Clean Core Architecture Guide - Production guide for SAP Advanced Event Mesh (AEM/Solace), topic taxonomy standards, DMR mesh topologies, and CloudEvents 1.0.
50. SAP Clean Core RAP BDEF Extension & Extensibility Guide - Production guide for extending standard SAP RAP Business Objects via BDEF extensions in S/4HANA.
51. SAP Clean Core Automated ATC Remediation & QuickFix Guide - Production guide for building custom QuickFixes with cl_ci_quickfix in Eclipse ADT.
52. SAP Clean Core OData Client Proxy Guide - Production guide for remote OData consumption using Service Consumption Models and BTP Destinations.
53. SAP Clean Core IDoc to CloudEvents & RAP Guide - Production guide for retiring ALE/IDocs, adopting CNCF CloudEvents on Event Mesh, and atomic RAP EML.
54. SAP S/4HANA Output Management & Adobe Forms Guide - Production guide for retiring NAST, configuring BRFplus OPD decision tables, and BTP Adobe Forms.
55. SAP Universal Journal (ACDOCA) & Clean Core Finance Guide - Production guide for replacing BSEG substitutions with FINS_ACDOC_POSTING_EXTENSION and RAP EML.
56. SAP Clean Core Parallel Processing Guide - Production guide for replacing aRFC with cl_abap_parallel, cursor chunking, and worker scaling.
57. SAP Clean Core Application Log (cl_bali_log) Guide - Production guide for cl_bali_log, RAP save sequence logging without LUW errors, and Fiori App F1487.
58. SAP RAP Mass Operations & Side Effects Guide - Production guide for multi-record actions, abstract parameter entities, and @Common.SideEffects.
59. SAP S/4HANA CVI & Business Partner Architecture Guide - Production guide for Customer-Vendor Integration, MDS synchronization, and KNA1-to-CDS queries in Clean Core.
60. SAP OData $batch & Atomic ChangeSet Architecture Guide - Production guide for OData $batch, atomic ChangeSets, Content-ID referencing, and eliminating partial commits.
61. SAP RAP Behavior Augmentation & Pre-Check Guide - Production guide for extending SAP standard business objects cleanly with BDEF augmentations and pre-checks.
62. SAP RAP Concurrency Control, Draft Locking & ETag Guide - Production guide for SAP RAP optimistic concurrency, draft locking mechanics, and Total ETag vs Local ETag.
63. SAP Zero-Downtime Table Migration & Cutover Guide - Production guide for migrating high-volume custom tables with shadow tables, cursor chunking, and zero-downtime cutover.
64. SAP CDS Virtual Elements & SADL Calculation Architecture Guide - Production guide for procedural calculation exits, IF_SADL_EXIT_CALC_ELEMENT_READ, and Fiori criticality in ABAP Cloud.
65. SAP Clean Core Document Management & CMIS Architecture Guide - Production guide for offloading binary attachments using SAP BTP DMS and OASIS CMIS 1.1.
66. SAP BTP MTA & Approuter Architecture Guide - Production guide for SAP BTP Cloud Foundry Multi-Target Applications, Approuter reverse proxying, and XSUAA security.
67. SAP ABAP Cloud IAM & Business Catalog Architecture Guide - Production guide for ABAP Cloud Identity and Access Management, IAM App descriptors, and RAP authorization handlers.
68. SAP BTP Kyma & Serverless Clean Core Extensibility Guide - Production guide for SAP BTP Kyma runtime, Serverless Functions, Istio APIRules, and Kubernetes side-by-side extensions.
69. SAP BTP Principal Propagation & OAuth User Token Exchange Architecture Guide - Production guide for configuring end-to-end user identity propagation, Cloud Connector X.509 certificates, and CERTRULE mapping.
70. SAP gCTS, abapGit & Clean Core CI/CD Pipeline Architecture Guide - Guide for SAP gCTS, abapGit, automated ATC quality gates, and Git-centric release pipelines in ABAP Cloud.
71. SAP Event Mesh Topic Taxonomy & Subscription Architecture Guide - Guide for SAP Event Mesh & AEM topic hierarchies, wildcard subscriptions, and DLQ resiliency.
72. SAP S/4HANA Custom Code Migration Scoping & Package Architecture Guide - Strategic guide on scoping legacy custom code, SUSG decommissioning, and multi-tier ADT package hierarchies.
73. SAP RAP Business Event Consumption & Ingestion Architecture Guide - Guide for ingesting CloudEvents into SAP RAP using HTTP webhooks, EML (MODIFY ENTITIES), and idempotency tracking.
74. SAP RAP Transactional Outbox Pattern & Event Delivery Guide - Guide on eliminating dual-write risks between SAP HANA and Event Mesh with atomic Outbox dispatchers.
75. SAP Change Documents & Audit Trail Architecture in ABAP Cloud Guide - Complete guide for Change Document Objects (CHDO), CL_CHDO_WRITE_TOOLS, and SOX audit compliance.
76. SAP RAP Custom & Unmanaged Query Provider Architecture Guide - Deep-dive on implementing IF_RAP_QUERY_PROVIDER, custom entities, $filter ranges, and Tier-2 legacy integration.
77. SAP Clean Core Contract C1 Release & API Governance Architecture Guide - Release Contracts (Contract C1), Business Object Interfaces, and API state lifecycle.
78. Zero-Downtime Clean Core Cutover & Feature Flag Architecture Guide - Strangler Fig migrations, Canary cutovers, and in-memory Feature Flags in ABAP Cloud.
79. SAP ATC Baseline & Exemption Governance Architecture Guide - Manage legacy technical debt with ATC Baselines, exemption workflows, and CTS release gates.
80. SAP BTP Cloud Connector & Hybrid Connectivity Guide - Reverse-invoke secure tunnels, Principal Propagation, Virtual Hosts, and BTP Destination Service.
81. SAP RAP Draft Architecture & Concurrency Lock Management Guide - Draft persistence, ETag concurrency, enqueue locks, and automated housekeeping.
82. SAP Embedded Analytics & CDS Analytical VDM Guide - Virtual Data Model (VDM) analytical cube architecture, #DIMENSION, and currency conversion.
83. SAP Application Jobs & Background Scheduling Guide - Architecture rules for cl_apj_rt_api, if_apj_rt_exec_object, and Application Log cl_bali_log.
84. SAP S/4HANA Key-User Extensibility Guide - Business Contexts, YY1_* Custom Fields, Restricted ABAP sandbox rules, and Cloud BAdIs.
85. SAP RAP: Managed vs Unmanaged Deep-Dive - Architectural comparison of Pure Managed, Unmanaged Save, Late Numbering, and Draft lifecycles in ABAP Cloud.
86. SAP CDS Access Control & DCL Security Guide - Declarative row-level security: PFCG authorizations, RAP instance access controls, and privileged queries.
87. Developer Extensibility BAdI Architecture Guide - Implementation patterns for ABAP Cloud BAdIs (IF_EX_*), filter contexts, fallback classes, and exception isolation.
88. SAP Event Mesh & CloudEvents Architecture - Decoupled event-driven architecture, RAP business events in ABAP Cloud, and BTP CAP consumer services.
89. Enterprise Grounded RAG on SAP BTP - Production reference blueprint for SAP Generative AI Hub, HANA Cloud Vector DDL, and CAP prompt orchestration.
90. Tier-2 Quarantine Wrapper Step-by-Step Implementation - How to safely isolate legacy BAPIs and unreleased standard code using C1 release contracts.
91. Clean Core Extensibility Decision Matrix - Exhaustive guide on when to select Tier 1 (On-Stack ABAP Cloud), Tier 2 (Quarantine Wrapper), or Tier 3 (Side-by-Side BTP).
92. ABAP Cloud Syntax Rules: What is Forbidden vs. Allowed - Complete cross-reference mapping legacy procedural ABAP statements to modern cloud expressions.
93. RAP Transactional Model & Behavior Definition Cheat Sheet - Rapid reference for managed, unmanaged, early/late save, determinations, and validations.
94. 3-Tier Extensibility Architecture Guidelines - Deep enterprise governance patterns and operational boundaries.
95. ATC Clean Core Remediation Guide - Step-by-step resolution for ATC Priority 1 & 2 transport blockers under variant ABAP_CLEAN_CORE_DEVELOPMENT.

Enterprise Books & Reference Guides

• The Definitive Guide to ABAP Cloud & Clean Core Extensibility by Andrea Antonio Perrelli
• 440+ pages | 36 Production Architectural Patterns | 100% S/4HANA 2026 Ready
• Available on Amazon Paperback ($19.99) & Kindle ($12.99)

• Instant Digital Download (€7.00 with 80% OFF code FLASH80)

• The SAP BTP & Business AI Architecture Companion by Andrea Antonio Perrelli

• 340+ pages | Side-by-Side CAP & RAP | Event-Driven Architecture | Generative AI Platform
• Available on Amazon ($12.99)

• Instant Digital Download (€9.80 with 80% OFF code FLASH80)

• Complete Clean Core & SAP BTP Enterprise Suite (Bundle)

• Includes both books, offline high-resolution Retina diagrams, complete ABAP pattern repository, and free lifetime updates.

• Instant Access (€9.80 with code FLASH80)

• Free Architectural Sample PDF (19 Pages)

• Full Chapter 1 preview with high-res architecture schematics and Clean Core maturity model.

Contributing

Contributions, additions, and pattern suggestions are welcome! Please open an issue or submit a pull request on the GitLab Repository.