So I am a newbie to seem and i am playing with it right now and trying to see what i can do.

Situation:
1) Postgresql 8.4
2) JBOSS Seam Generate Entities.

Simplified:
I have table A, table B and a connecting table AB1 and another connecting table AB2.

In table B on the getBs the mappedby=As
Also in table B on the getBs_1 the mappedby is again As when it should have been A_1s

I.e. while it is almost perfect the mappedby should have said A_1s :)
had to manually edit this (OMG! :) ).