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How to define DbContext in entity structure?

I have multi-user objects in one project, and because of UNKNOWN EF, an Exception is thrown:

"It is not possible to determine the relationship between two objects because they are associated with another ObjectContext"

I understand that, but my question is:

How can I determine the context of an object? is there an id? or something different?

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This is subtle. Most likely you have two different instances of your db context, and one of the entities in the relation was retrieved with the first instance of the context, while the other object was retrieved with a different context node.

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