[eluser]OverZealous[/eluser] @tdktank59
Do you have trouble saving any other relationships? Or just this one?
Crap, accidentally submitted
I recommend backing up the current libraries/datamapper.php file, and replacing it with the one attached. This will allow you to see what's happening with the save.
It may not show anything, in that case, DMZ doesn't see any object to save in the ->save() command, for some reason.