Indeed such a scenario was supported with the classic API of Telerik Data Access. Currently, Visual Designer does not allow it. The reasons for this decision were the need of manually performed changes on one side (which makes the approach error prone), and the inability to introduce support about it for all backends, on the other side.
Do let us know, if you have further questions.
OpenAccess ORM is now Telerik Data Access
. For more information on the new names, please, check out the Telerik Product Map