Message in Spanish (Español)
'<var>X</var>.<var>Y</var>' no está marcado con OptionalFieldAttribute; por tanto, indica que se debe serializar. Sin embargo, '<var>X</var>' se deriva de una clase marcada con DataContractAttribute y un valor IsReference de '<var>Z</var>'. No se pueden tener miembros de datos necesarios en clases IsReference. Incluya OptionalFieldAttribute en '<var>X</var>.<var>Y</var>' o deshabilite el valor IsReference en la clase primaria correspondiente.
Unlocalized message
'<var>X</var>.<var>Y</var>' is not marked with OptionalFieldAttribute, thus indicating that it must be serialized. However, '<var>X</var>' derives from a class marked with DataContractAttribute and an IsReference setting of '<var>Z</var>'. It is not possible to have required data members on IsReference classes. Either decorate '<var>X</var>.<var>Y</var>' with OptionalFieldAttribute, or disable the IsReference setting on the appropriate parent class.
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