Для связи передано недопустимое значение EntityState. Значение EntityState должно быть одним из следующих: Added, Deleted, Detached или Unchanged. Для связей нельзя задать состояние Modified.

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The EntityState value passed for the relationship is not valid. The EntityState value must be one of the following: Added, Deleted, Detached, or Unchanged. Relationships cannot be set to the Modified state.

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