No se puede usar la propiedad de navegación '<var>Property Name</var>' en el tipo '<var>Type Name</var>' porque el conjunto de entidades '<var>X</var>' no tiene un conjunto de asociaciones especificado para ella.

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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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