ABAP Cloud & the Clean Core Level Concept

Guide for developing with the ABAP Cloud programming model, classifying extensions using the clean core level concept (A–D), and applying clean core principles.

Terminology note: SAP has evolved the former 3-tier extensibility model into the clean core level concept. The 3-tier model (Tier 1/2/3) is superseded — use Levels A, B, C, D instead. Current product naming: SAP Cloud ERP (public), SAP Cloud ERP Private (formerly S/4HANA Cloud Private Edition), SAP Business AI Platform (includes SAP BTP capabilities), SAP Build (pro-code and low-code tooling, includes ABAP Cloud).

Workflow

1. Determine the user's context:
   • Understanding ABAP Cloud concepts and restrictions
   • Classifying an extension into a clean core level
   • Choosing between ABAP Cloud development and classic ABAP development
   • Wrapping non-released APIs for use in ABAP Cloud
   • Identifying released or classic API alternatives