Constraints on relationship stereotype

[makartetsky]

Dear all,

i am trying to impose a constraint on relationship based on dependency relation as a meta-class. What I want to do is to permit a relationship to be instantiated only between element of type elementA and elementB. I tried to define a pre-condition of following type:
self.Source =elementA and self.Destination=elementB
but it seems to be not working, since after importing such a profile EA permits to establish this relationship between any elements.
Any ideas?

Best regards.
Denis