CompositionAttribute をメンバー '<var>Member</var>.<var>X</var>' に適用できません。CompositionAttribute が適用できるのは AssociationAttribute が設定されたメンバーだけです。

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CompositionAttribute cannot be applied to member '<var>Member</var>.<var>X</var>'. CompositionAttribute can only be applied to members marked with AssociationAttribute.

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