Message in Japanese (日本語)
参照整合性制約の違反が発生しました。オブジェクトに非一時キーが含まれているときは、参照整合性制約の一部であるプロパティを変更できません。
Unlocalized message
A referential integrity constraint violation occurred: A primary key property that is a part of referential integrity constraint cannot be changed when the dependent object is Unchanged unless it is being set to the association's principal object. The principal object must be tracked and not marked for deletion.
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