I'm not sure if this is the correct forum to place it in, but from the help articles it appears that a relationship class should enable automatic updates of attribution from the origin to the destination, vice versa, or both depending upon how the class is built. I however have only been able to delete items in one and subsequently delete the related items in the other class. I have been unable to edit one record and have that send a message to the other to "update" the attribution. Any suggestion or points in the right direction would be greatly appreciated.