Solution : https://service.sap.com/sap/support/notes/1520180 (SAP Service marketplace login required)
Key words : 
user data source, terms pss email, symptom understand, service functionality, sap system, prerequisites understand, maintained
Related Notes : 
       
| 1600685 | Password Self Service: HR questions configured not showing | 
| 1591058 | sql.DuplicateKeyException: ORA-00001: Unique Constraint.. |