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There is model:
BaseObject - abstract
-Id: Guid (Entity Key)
NamedObject: BaseObject (TPC) - abstract
-Name: String
Parent: NamedObject (TPC)
Child: NamedObject (TPC)

I trying to add 1:n association between Parent (parent class) and Child (child class) with Delete cascade and Add FK to the child class options and get this error:

"An error occured during creating constraint in storage model. Referential constraint property 'Id' association 'Parent_Child' is not mapped to any column in storage table"

Thank you for the report, we have reproduced the issue. We will analyze it and inform you about the results as soon as possible.

We have fixed the issue. The fix is available in the latest 4.1.71 build of Entity Developer. The new build can be downloaded from
http://www.devart.com/entitydeveloper/download.html
(the trial and free versions) or from Registered Users' Area (for users with active subscription only).

For the detailed information about the fixes and improvements available in Entity Developer 4.1.71, please refer to
http://www.devart.com/forums/viewtopic.php?t=22541