The provisions of the law of the Member State in which the reorganisation measure was taken or winding-up proceedings were opened in respect of an insurance undertaking whose registered office is situated within the territory of a Member State of the European Union other than France relating to the nullity, nullity, voidability or unenforceability of acts prejudicial to all creditors are not applicable, if the beneficiary of such an act proves that the latter is subject to the law of another Member State and that this law does not allow by any means to challenge this act in the case in question.