29In particular, in so far as the principle of effectiveness mentioned in paragraph 28 above is concerned, that principle precludes, first, the application of national rules of procedure that would make reliance on Article 13 of Regulation No 1346/2000 impossible or excessively difficult by providing for rules which are too onerous, especially in connection with proof of the negative, namely that certain circumstances did not exist. Second, that principle precludes national rules of evidence that are not sufficiently rigorous, the application of which would, in fact, have the effect of shifting the burden of proof laid down in Article 13 of the regulation.
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