SAP S/4HANA Clean Core Output Management

1. Why Classic NAST is Dead in Clean Core

In SAP ECC and early S/4HANA releases, document output (invoices, purchase orders, shipping notes) relied on message control via table NAST, transaction NACE, and procedural print programs linked to SAPscript or SmartForms.

In modern SAP S/4HANA (Private Cloud, Public Cloud, and On-Premise 2023+), NAST is officially deprecated and incompatible with Clean Core:

• Modifications and Implicit Enhancements: Classic print programs frequently bypass standard security and direct-read unreleased tables.
• Tight Coupling: NAST directly couples document commit logic with print spool generation, causing lock contention in transactions like VF01 and ME21N.
• Cloud Incompatibility: In ABAP Cloud, classic spool access (SP01, TSP01) is strictly prohibited. Output must be handled via Adobe Document Services (ADS) and managed Cloud Print Queues.

2. Architectural Comparison: NAST vs. S/4HANA Output Control (OPD)

Capability	Classic NAST (Deprecated)	S/4HANA Output Control (OPD - Clean Core)
Configuration Engine	Transaction NACE, Table TNAPR	Transaction OPD (BRFplus Decision Tables)
Language Scope	Classic Unrestricted ABAP	Strict ABAP Cloud / Released APIs
Form Technologies	SAPscript, SmartForms, Classic PDF	Adobe Document Services (ADS) Master Forms
Spool & Routing	SAP Spool (SP01) via Host Spooler	BTP Cloud Print Queues & Cloud Print Manager (CPM)
Dispatch Mechanism	Report RSNAST00	Application Job APOC_OR_MESSAGES_DISPATCH

3. The 6-Step BRFplus OPD Determination Flow

When an S/4HANA business object is saved (e.g. via RAP EML or standard transactions), S/4HANA Output Control executes a series of sequential BRFplus decision tables configured in transaction OPD:

1. Output Type: Evaluates business attributes (e.g., Billing Type F2 -> BILLING_INV).
2. Receiver: Determines business partners to receive output (e.g., Sold-To Party, Bill-To Party).
3. Channel: Determines delivery mechanism (PRINT, EMAIL, EDI).
4. Printer / Print Queue: Maps user or plant to a clean core Cloud Print Queue.
5. Form Template: Selects Adobe Master Form Template (e.g., SOMU_FORM_INVOICE_ADS).
6. Output Relevance: Final gatekeeper rule verifying whether the document status qualifies for output.

4. Interactive Architecture Generator

Generate production BRFplus decision tables, ABAP Cloud print queue handlers, and BAdI parameter implementations:

🖨️ Launch Tool #101: S/4HANA Output Management Architect →

5. S/4HANA NAST Decommissioning Checklist

• Identify legacy NAST message types in transaction NACE (e.g., RD00, NEU, BA00).
• Convert SmartForms/SAPscript layouts into Adobe Document Services (ADS) Master Form templates.
• Configure Business Application Object mapping in transaction OPD.
• Set up SAP Cloud Print Manager (CPM) agents in local networks and link to BTP Cloud Print Queues.
• Deactivate NAST update triggers and schedule the clean core dispatch job APOC_OR_MESSAGES_DISPATCH.