ManyToMany Relation returns transient objects

Hi,

I'm on the latest release 4.2 of Cayenne and run in a problem when creating
a many to many relationship.

I had table A und table B and a joining table C which contain the ID
columns of A and B
The relation is defined as many to many and Dep PK is marked for A and B,
further the cascading of deletion is set to NO ACTION

Now when I create / add a new relation commit the work and the delete the
relation everythings of, but when I do the same again, create the  same
relation as before and delete it! A relation function returns a object C in
transient state?

regards
Meex