Solution : https://service.sap.com/sap/support/notes/1633576 (SAP Service marketplace login required)
Key words : 
grc role management reason, solution kindly implement, prerequisites reason, existing role, role generation, transaction code, menu structure, successfully added, / backend systems, generating roles
Related Notes : 
       
| 1607067 | Master Note for SAP Access Control 10.0 - Support Pack 6 |