Количество элементов конфликтует со справочным ограничением в Role "<var>X</var>" в связи "<var>Y</var>". Поскольку все свойства в Dependent Role не допускают значение null, количество элементов Principal Role должно быть "1".

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Multiplicity conflicts with the referential constraint in Role '<var>X</var>' in relationship '<var>Y</var>'. Because all of the properties in the Dependent Role are non-nullable, multiplicity of the Principal Role must be '1'.

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