Message in Chinese (Traditional) (中文(繁體))![](/img/flags/zh-Hant.png)
多重性在關聯性 '<var>Y</var>' 中的 Role '<var>X</var>' 中無效。由於 Dependent Role 中的所有屬性都可為 Null,Principal Role 的多重性必須是 '0..1'。
Unlocalized message![](/img/flags/en.png)
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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