Maintain Source System Mappings
The "Maintain Source System Mappings" can be found in the tab "Administration" in the ribbon "Maintain SAP Systems".
Here you can specify which source system is connected to which target system by entering the connection ID.
The Source System Mapping is important for the correct behavior of some functions of the Performer Suite (e.g. Data Flow or Where-Used Analysis of BW & HANA entities in SAC Entities).