Clean Core Governance and Documentation

Explanation

Clean Core is not only a developer practice. It requires governance. Teams should define what extension options are allowed, how exceptions are approved, how custom code is documented, how ATC findings are tracked and how upgrade risk is reviewed. Without governance, teams may slowly rebuild an unclean core even after migration. Each extension should have a business owner, technical owner, reason, chosen extension type, risk level and lifecycle plan. Good governance helps keep the S/4HANA system upgrade-ready.

Code example

* Clean Core extension record example:** Object Name      : ZCL_SD_ORDER_VALIDATOR* Business Owner  : Sales Operations* Technical Owner : ABAP Team* Extension Type  : Released BAdI + service class* Reason          : Mandatory compliance validation before order save* Risk Level      : Medium* API Usage       : Released API only* ATC Status      : No priority 1 findings* Review Date     : Before next upgrade cycle * Purpose:* Documentation makes future upgrade and support easier.

Real project scenario

A company created a Clean Core review process where every new enhancement request had to declare whether it used configuration, key-user extensibility, released BAdI, API or side-by-side extension.

Common mistakes

- Treating Clean Core as one-time migration task. - No review process for new custom code. - No owner for custom extensions. - No exception tracking for risky objects.

Best practices

- Create extension decision records. - Track ATC findings. - Review high-risk custom code regularly. - Assign business and technical owners. - Control exceptions formally.

Interview angle

Architect interviews may ask how to sustain Clean Core after go-live. Governance and review process are key points.