Message in Spanish (Español)
Puesto que ServiceContract base '<var>Contract Name</var>' tiene CallbackContract 'X', ServiceContract derivado 'Y' debe especificar también 'X' o un tipo derivado como CallbackContract.
Unlocalized message
Because base ServiceContract '<var>Contract Name</var>' has a CallbackContract 'X', derived ServiceContract 'Y' must also specify either 'X' or a derived type as its CallbackContract.
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