I have the follwing scenario:
One-way relationship, musician-group, musician should ask for the relationship, relationship must be approved by the group

My permissions as they should be (Musician|Group):
have +|+
maintain -|+ (group must approve relation)
request +|- (only musicians can ask for relationship, not viceversa)
delete +|+

With this setup the group has no oportunity to accept or decline relations. In the tableview the links are missing.

When I set:
request ++

it works, but I have an additional menu for pending relationships group to musician which I don't want.