Не удалось добавить объект к EntityCollection или EntityReference. Объект, присоединенный к контексту ObjectContext, нельзя добавлять к EntityCollection или EntityReference, не связанным с исходным объектом.

Message in Russian (Русский)

Unlocalized message

The object could not be added to the EntityCollection or EntityReference. An object that is attached to an ObjectContext cannot be added to an EntityCollection or EntityReference that is not associated with a source object.

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