ABAP & Development

What is Custom Code?

Customer-developed ABAP objects, typically in the Z, Y, or registered namespace, extending or changing SAP behavior.

Custom code is the primary driver of S/4HANA conversion effort and upgrade risk. Usage analysis often shows a large share is unused and can be retired. Remediation, retirement, and regression testing should be planned from usage data.

Related terms

Custom Code Migration
The analysis and adaptation of custom ABAP code for S/4HANA compatibility using ATC checks and usage data.
Usage Procedure Logging
Logging of executed ABAP procedures to identify which custom code is actually used, with SCMON as the lightweight alternative.
Clean Core
SAP's principle of keeping ERP code and configuration close to standard, with extensions built only through stable, released interfaces.
ABAP Test Cockpit
SAP's framework for running static checks on ABAP code, including syntax, performance, security, and S/4HANA readiness.

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