Entity Framework 4: inheritance and Associations

I do derive my entities from a base-class that provides tracking.

Since User derives from TrackableBase and TrackableBase is associated with User, I get an error:

"Unable to determine a valid ordering for dependent operations. Depe开发者_运维问答ndencies may exist due to foreign key constraints, model requirements or store generated values."

Is this model just not possible, or am I doing something wrong?