31In those circumstances, the answer to the second and third questions is that, for the purposes of the application of Article 13 of Regulation No 1346/2000 and in the event that the defendant in an action relating to the voidness, voidability or unenforceability of an act relies on a provision of the lex causae under which that act can be challenged only in the circumstances provided for in that provision, it is for that defendant to plead that those circumstances do not exist and to bear the burden of proof in that regard.
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