HI Nagarajan
Yes in my example, the SYS* are all connected systems.
You could have:
SYS1 - SAP ECC/ERP
SYS2 - SAP SRM
SYS3 - SAP BI
So a user may have ECC and CRM access but not BI. Or a BI users may just report there but not have ECC/CRM.
Although most users would probably have ECC/ERP access you can't guarantee all users will belong in one system unless you have a specific identify management model for this. The multiple data sources provides the flexibility to tell GRC where you users exist.
Regards
colleen