EntityCollection または EntityReference にオブジェクトを追加できませんでした。ObjectContext にアタッチされているオブジェクトは、ソースオブジェクトに関連付けられていない EntityCollection または EntityReference に追加できません。

Message in Japanese (日本語)

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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