No se especificó EntitySet para End '<var>X</var>' en AssociationSet '<var>Y</var>' y no se puede inferir porque ninguno de los elementos de EntitySet es del tipo correcto.

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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 none of the EntitySet elements are of the correct type.

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