Solution : https://service.sap.com/sap/support/notes/847439 (SAP Service marketplace login required)
Key words :
supplier relationship management reason, 'element list' tab page, hr/ale distribution active', enterprise buyer professional edition, active central user administration, active hr replication, central user administration, attached correction instructions, message class 'bbpu_messages', manually enhance screen '400'
Related Notes :
| 928575 | USERS_GEN in CUA and HR replication environment |
| 876186 | EBP 5.0+: USERS_GEN locked when CUA is active |
| 772347 | SRM 4.0: BBPUSERMAINT deactivated for CUA |