Solution : https://service.sap.com/sap/support/notes/1393082 (SAP Service marketplace login required)
Key words : 
central user administration active, central user administration, existing su01 users, attached correction instructions, error message appears, prerequisites error, program error, srm system, create employee', solution implement
Related Notes : 
       
| 1104666 | SRM 6.0: USERS_GEN - Role is not saved | 
| 402592 | EBP in the environment of a Central User Administration |