Adapting custom code is an important step in a brownfield migration to S/4HANA. Here are some general steps to follow:
Conduct a code analysis: Before starting the migration process, conduct a thorough analysis of the custom code to determine its compatibility with S/4HANA. Use tools such as the ABAP Test Cockpit (ATC) and SAP Readiness Check to identify any issues.
Review the impact of changes: Assess the impact of changes to the custom code on the overall system. Determine whether modifications are needed to the code to make it compatible with S/4HANA.
Perform remediation and adjustment: Make any necessary modifications to the custom code to ensure compatibility with S/4HANA. Consider using SAP S/4HANA migration cockpit, which has features to handle the remediation automatically.
Test the custom code: Once the modifications are complete, test the custom code to ensure it is functioning correctly.
Deploy the custom code: Deploy the modified custom code in the S/4HANA system and monitor its performance to ensure it is working as expected.
It is important to note that the exact steps for adapting custom code in S/4HANA brownfield migration can vary depending on the specific requirements of the project. It is always recommended to work with an experienced SAP partner or consultant to ensure a successful migration.