リレーションシップ '<var>Y</var>' の Role '<var>X</var>' の Multiplicity が無効です。Dependent Role のすべてのプロパティが NULL 許容であるため、Principal Role の複数要素の接続性は '0..1' にする必要があります。

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Unlocalized message

Multiplicity is not valid in Role '<var>X</var>' in relationship '<var>Y</var>'. Because all the properties in the Dependent Role are nullable, multiplicity of the Principal Role must be '0..1'.

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