Не был указан набор EntitySet для элемента End "<var>X</var>" в наборе AssociationSet "<var>Y</var>", и его невозможно вывести вследствие неоднозначности набора EntitySet. Можно использовать несколько наборов EntitySet. Необходимо явно задать элемент с атрибутом EntitySet.

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The EntitySet for the End '<var>X</var>' in AssociationSet '<var>Y</var>'was not specified, and cannot be inferred because the EntitySet is ambiguous. More than one EntitySet could be used; an explicit End element with an EntitySet attribute must be specified.

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