Hey Peter,
thank you. There seems to be another issue with the order of the related users. When I didn't change the order of the related users in the specific post all new users are added at the end of the list (which is correct, picture 1). As soon as I change the order (picture 2) and add another users via MB_Relationships_API::add the order seems to be completely random (picture 3).
Should I open a new post or are they related?
Thanks,
Manuel