Нельзя использовать свойство навигации "<var>Property Name</var>" для типа "<var>Type Name</var>", поскольку для набора сущностей "<var>X</var>" не задан набор ассоциаций.

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Unlocalized message

Navigation property '<var>Property Name</var>' on type '<var>Type Name</var>' cannot be used because the entity set '<var>X</var>' does not have an association set specified for it.

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