RH_GET_PERSON_FROM_USER - no result

Hello,

we are using org.management and we assign user-id to possition. In my understanding i can get with fuction modul RH_GET_PERSON_FROM_USER the releated personell no. But there is no result... I checked the relationship and there exist A 008 from position (S) to user (US)....

By the way, we don't want to use IT 0105.

Thanks for any help.

Markus