Solution : https://service.sap.com/sap/support/notes/1597025 (SAP Service marketplace login required)
Key words :
transaction scum --> logon data, prerequisites program error, terms password reset, parent/child system, child system, scum settings, symptom password, initial password, access controls 10, cua systems
Related Notes :
1591209 | CUA child system-password reset issue |
1591123 | Master Note for SAP Access Control 10.0 - Support Pack 5 |