Well...
Seems that i really need to make it work with the LDAP provider because :
I need to change properties (and also clear them) that are not system based. These were implemented with a schema extension of the user class.
And... These kind of properties are not seen with the WinNT provider...
AFTER SOME TESTING (on the same object) :
- WINNT : ok to view, fill or empty any system based property. but cannot address extented-schema based properties.
- LDAP : ok to view or fill any type of property. but cannot empty any.
Thanks for your help (maybe i missed something ?).