What is a Brownfield SAP S/4HANA migration?

During the Brownfield migration to the SAP S/4HANA environment, all existing configurations, custom code, business processes, master data, and transaction history are carried forward. This means your team begins with a familiar system that has undergone a system conversion — upgraded, not redesigned.

The underlying database switches to SAP HANA as part of the system conversion for SAP S/4HANA migration. The data model is simplified, ensuring a smoother transition during the brownfield migration. Custom code is assessed and updated to ensure compatibility with S/4HANA. Additionally, SAP Fiori replaces the legacy SAPGUI interface where applicable.

Brownfield migration works best when you are satisfied with your current processes and data quality. If your priority is to achieve an SAP S/4HANA migration with minimum disruption — rather than redesigning your processes from the ground up through a system conversion — then this approach is ideal.

If your legacy data is outdated or your processes exhibit significant inefficiencies, a brownfield migration will carry those issues into the new system. In such cases, opting for a Selective Data Transition or a greenfield approach may provide better long-term value for your SAP S/4HANA migration.