Объект нельзя добавить или присоединить, поскольку его свойство EntityReference имеет значение свойства EntityKey, которое не совпадает с ключом EntityKey для этого объекта.

Message in Russian (Русский)

Unlocalized message

The object could not be added or attached because its EntityReference has an EntityKey property value that does not match the EntityKey for this object.

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