Could you please provide us with additional information regarding the wrong behavior you are facing? What kind of identity mechanism is being used for these entities? It looks like custom values are being provided as primary key, but not database / client-side generated ones. A sample application which demonstrates the error will be highly appreciated.
We are looking forward to hearing from you.
the Telerik team
Q3'12 SP1 of OpenAccess ORM packs Multi-Table Entities mapping support. Check it out.