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Unable to update the EntitySet '' because it has a DefiningQuery and no

Problem: Unable to update the EntitySet '' because it has a DefiningQuery and no element exists in the element to support the curr...

Problem: Unable to update the EntitySet '' because it has a DefiningQuery and no element exists in the element to support the current operation.

Solution: This problem has been plaguing me again and again :-D. Usually when I'm working on old application with old database. For some reason the tables on this old database doesn't have a primary key.

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