ATC Clean Core & Cloudification Repository Checks

Configure ABAP Test Cockpit (ATC) clean core checks against the SAP Cloudification Repository, and map findings to clean core levels (A, B, C, D) for governance and remediation planning.

The clean core level concept supersedes the former 3-tier extensibility model. ATC is the governance tool that makes levels measurable: priority 1 → Level D, priority 2 → Level C, priority 3 → Level B, no finding → Level A.

Overview

The SAP Cloudification Repository contains the release state and clean core classification of SAP objects. Its JSON files serve as ATC check content, enabling customers and partners to analyse custom code across all ECC and S/4HANA releases.

Quick Reference

Read references/quick-reference.md for:

• JSON file URLs for each target product and version
• ATC check variant configuration steps
• Available JSON files and their purpose
• SAP Notes required for setup

Configuration by Target Product

SAP Cloud ERP

1. Activate in your ATC check variant: "Cloud Readiness" → Usage of Released APIs (Cloudification Repository)
2. In the check attributes, enter the URL:

   https://raw.githubusercontent.com/SAP/abap-atc-cr-cv-s4hc/main/src/objectReleaseInfoLatest.json

SAP Cloud ERP Private

1. Activate in your ATC check variant: "Clean Core" → Usage of Released APIs (Cloudification Repository)
2. In the check attributes, enter the URL for your version:

• Latest version: https://raw.githubusercontent.com/SAP/abap-atc-cr-cv-s4hc/main/src/objectReleaseInfo_PCELatest.json
• Specific release: Replace PCELatest with the version, e.g. PCE2025_0 for Release 2025 FPS00

New Clean Core Check (Note 3565942)

For the newer ATC checks "Usage of APIs" and "Allowed Enhancement Technologies", use:

https://raw.githubusercontent.com/SAP/abap-atc-cr-cv-s4hc/main/src/objectClassifications_SAP.json

Clean Core Levels and Object Classification

Extensions are classified into clean core levels (A–D) based on the SAP objects they consume. An extension takes the lowest level of any object it uses.

The clean core level concept supersedes the former 3-tier extensibility model.

Clean core status: Level A = clean core · Levels B and C = conditional clean core · Level D = not clean core.

Key rules

• Level A (Released): use for all new development. Discover via SAP Business Accelerator Hub, Cloudification Repository, or ADT.
• Level B (Classic API): acceptable for classic ABAP development where no released API exists. Wrappers around classic APIs are Level B and can be released for ABAP Cloud consumption. Do not force rewrites of stable classic code.
• Level C (Internal): minimize. Wrap remaining usages and create a single ATC exemption. Use the changelog for SAP objects to detect upcoming incompatible changes.
• Level D (Not recommended): eliminate immediately. Includes noAPI objects, modifications, implicit/explicit enhancements, direct table writes, form routine calls, and critical ABAP statements.
• Deprecated: still Level A/B, but adopt the successor API.

JSON files and states

• objectReleaseInfo*.json — release state of SAP objects: released, deprecated, notToBeReleased, notReleased
• objectClassifications_SAP.json — clean core classification: classicAPI (Level B), noAPI (Level D), internalAPI (Level C with a released successor available)
• Labels: remote-enabled (RFC-enabled), transactional-consistent (usable inside RAP-based applications)

Classified object types: FUNC (function modules), CLAS (classes), INTF (interfaces), STOB (CDS views), BDEF (BO interfaces).

DDIC objects (data elements, structures, table types) are not classified and are not checked when used as data types. Only SQL access to SAP tables is checked.

ATC Clean Core Checks

Configure a single global check variant used during development and on transport release. Set ATC transport settings so priority 1 and 2 findings block release.

If Usage of APIs or Allowed Enhancement Technologies is missing, implement SAP Note 3565942.

Check variant templates

• ABAP_CLEAN_CORE_DEVELOPMENT — SAP-delivered predefined variant for initial setup
• ABAP_CLOUD_DEVELOPMENT_DEFAULT — template to enrich with the checks above
• ABAP_CLOUD_READINESS — verify ABAP Cloud rules before switching an object's language version

Central ATC system

Set up a central ATC system for the whole landscape:

• Public cloud solution on SAP BTP — SAP's recommended option
• Or installed in the private cloud / on-premise landscape

ATC findings mapped to levels

Critical statements covered

CI_CRITICAL_STATEMENTS reports: kernel function calls · system-calls · editor calls · EXEC SQL · database hints · generation of reports and Dynpros · read/insert report · read/insert Dynpro · import/export nametab.

Exemption Strategy

• Focus exemptions on priority 1 (Error) and priority 2 (Warning) findings
• Do not exempt priority 3 (Info) findings such as classic API usage
• Use fine-granular, finding-level exemptions for clean core findings — best governance
• Use an ATC baseline only for legacy code you will not change, to hide a large set of findings
• Preferred practice: wrap the SAP object and consume the wrapper. N findings collapse to 1, so one exemption suffices
• Monitor adoption via the ATC exemption browser

Changelog for SAP Objects (Level C mitigation)

Internal SAP objects can change during an upgrade, feature pack import, or even an SAP Note import. The changelog proactively lists objects with incompatible changes in upcoming releases.

Incompatible changes include: deletion of objects · renaming or deletion of function module parameters · incompatible parameter type changes · renaming or deletion of methods in SAP classes · removal of fields from CDS views.

Covered object types: FUNC, CLAS, INTF, STOB, BDEF.

Setup:

1. Download the Simplification Database file from the SAP Software Download Center (SAP Support Portal)
2. Import via transaction SYCM
3. Run the changelog ATC check during development, or before the upgrade like other simplification item checks

Objects in the changelog are not automatically demoted to Level D — continued usage may be allowed depending on the change's criticality. Use findings to drive refactoring toward released or classic APIs.

Workflow

1. Determine the target product: SAP Cloud ERP or SAP Cloud ERP Private
2. Identify the correct JSON file using the quick reference
3. Verify prerequisites: implement SAP Note 3565942 (clean core checks) and review SAP Note 3578329 (classic technology classification)
4. Set up a central ATC system (SAP BTP recommended)
5. Configure one global check variant with the clean core checks and JSON URL
6. Configure transport settings so priority 1 and 2 findings block transport release
7. Import the changelog for SAP objects via SYCM for Level C risk assessment
8. Run ATC checks on custom code
9. Map findings to levels (P1→D, P2→C, P3→B) and determine the current overall level
10. Plan remediation: eliminate Level D, minimize Level C, monitor Level B, target Level A
11. Govern residual usage with fine-grained exemptions on wrappers

Output Format

When helping with ATC clean core topics, structure responses as:

## ATC Clean Core Guidance

### Configuration

- Target product: [SAP Cloud ERP / SAP Cloud ERP Private]
- JSON file: [URL]
- Check variant: [name and included checks]

### Finding Classification

| ATC finding | Priority | Clean core level | Action |
|-------------|----------|------------------|--------|
| ... | ... | ... | ... |

### Remediation Plan

[Ordered: Level D first, then C, then B]

### Exemption Recommendations

[Which findings justify an exemption and why]

Cloudification API Viewer

Use the online viewers to browse object classifications interactively:

• SAP Cloud ERP (release info): https://sap.github.io/abap-atc-cr-cv-s4hc/
• SAP Cloud ERP Private (release info): https://sap.github.io/abap-atc-cr-cv-s4hc/?version=objectReleaseInfo_PCELatest.json
• Clean core classification (classic APIs / noAPI / internalAPI): https://sap.github.io/abap-atc-cr-cv-s4hc/?version=objectClassifications_SAP.json

Filter by state:

• classicAPI → Level B candidates
• internalAPI → Level C with a released successor available
• noAPI → Level D, must be replaced

References

• Clean Core Extensibility Whitepaper — clean core level concept
• Extend SAP S/4HANA in the cloud and on premise with ABAP based extensions (Version 2.3, August 2025)
• Cloudification Repository: https://github.com/SAP/abap-atc-cr-cv-s4hc
• SAP Note 3565942 — delivers SYCM_USAGE_OF_APIS and SYCM_ALLOWED_ENH_TECHNOLOGY
• SAP Note 3578329 — classification of classic technologies, reuse services and frameworks

Related Skills

• abap-cloud: Use for clean core level definitions, development models, and wrapper classification
• abap-cloud-migration: Use for level-based remediation guidance after running ATC checks
• released-abap-classes: Use for finding Level A released API replacements identified by ATC
• badi-enhancement: Use for replacing Level D modifications and enhancements with BAdIs