Me too followed the guide put up by Andrew! Can't get it to work at all. I followed it closely many times and get the same errors as described by many! Webassist really needs to make a full guide including examples on the manage relational tables behaviour.
This ought to be on the top priority list after XMas!? I will follow this thread carefully!
I have 3 tables: 1 users table, 1 media table and one linking table with primary IDkey and foregin key fileds for the 2 tables I want to link (UserID and MediaID) Im certain Ive set up the tables right so it must be something in the behaviours that is either set up wrong or a bug! Im leaning to a bug at this time.