Is it possible to save model which has got circular dependency ?

I denormalized my Database:


User
--------
UserId
UserName
LastOrder   - fk to last order


Order
-------
OrderId
OrderName
UserId
OrderDate

Is it possible to save sth like this using entityFramework?

what should I change to make it work cause now I have got error:

Unable to determine a valid ordering for dependent operations. Dependencies may exist due to foreign key constraints, model requirements, or store-generated values.

c# .net entity-framework-4
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