Our ECC system had over 4,000 custom objects — and converting to S/4HANA meant cleaning house. This blog is my guide to custom code analysis, remediation, and survival during conversion.
Subtopics & Answers:
Running the Custom Code Migration App It flagged obsolete functions, deprecated tables, and syntax issues.
How we categorized and prioritized fixes We used ATC checks and grouped code by business impact.
Replacing legacy transactions and tables I explain how we adapted Z-reports that relied on VBFA, KONV, and others.
Working with developers and functional teams Collaboration was key — we held daily stand-ups and tracked fixes in Jira.
Testing and validation strategies We built test scripts for each module and used eCATT for automation.
What I learned about clean core strategy Less is more — and extensibility beats modification.
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