The Migrate Data Directly from SAP System method includes a limited number of predefined migration objects for which a direct connection to an existing SAP system is created through a Remote Function Call (RFC). Because not all migration objects are supported through this method, the Migrate Data Using Staging Tables method (either Local or Remote database schema) would need to be used for any remaining migration objects .
This scenario includes a communication arrangement to set up an RFC connection with the existing SAP ECC system. These setup instruction are provided in SAP Signavio Process Navigator: Data Migration to SAP S/4HANA from SAP (BH3).
The S/4HANA Migration Cockpit selects data from the SAP ECC source system using company codes, which an implementation consultant would specify when initially creating the migration project.

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Watch this video on how to migrate data directly from an SAP system with the SAP S/4HANA Migration Cockpit.