La ejecución de InstancePersistenceCommand se interrumpió por una colisión de claves. La clave de instancia con el valor 'X' no se puede asociar a la instancia porque ya está asociada a otra instancia.
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English version
The execution of an InstancePersistenceCommand was interrupted by a key collision. The instance key with value 'X' could not be associated to the instance because it is already associated to a different instance.