Business Partner in Solution Manager is used to represent a person/user or an organization having a role inside the processing of the different work request such a requester, approver, tester etc.
Here i am explaining How to create Business Partner in Solman 7.2:
1> Execute TCODE in Solution Manager 7.2:
BP_GEN Tcode is used create/maintain business partner for users already existing in the managed systems. This report only considers the users from the managed R/3 system & self solution manager system.
2> Select Manage System in RFC Destination which will be used for generating Business Partner and remove test run option:
3> Click on Execute & It will generate all Business Partner corresponding to all users which were defined in manage system: