FM: SO_USER_LIST_READ or another one

OK, been so long since I asked a question had to remember how to set my email watch to be sure I get responses and not loose it here in this huge forum ��

So I have the FM SO_USER_LIST_READ and it has the import parameter "USER_GENERIC_NAME" I thought at one time I could give it a query value other than * and it would return from the list only those that matched but no matter what I try in SE37 I get the entire user list.

Question: Is there another standard FM or what is the proper value to search for "DD" and only get the users with "DD"?