Solution : https://service.sap.com/sap/support/notes/830493 (SAP Service marketplace login required)
Key words :
optional import paramenter called 'self_register', su10 administration transactions, type reference type, bapiflag-bapiflag default, 'user' business object, business object repository, relevant support package, function module interface, assigned 'active' status, function modules bapi_user_create1
Related Notes :
| 862937 | SCUM: Initial password can be changed everywhere |
| 780485 | |
| 768509 | |
| 750390 | USR02: various problems with password attributes |
| 376856 |