47It is to be recalled at the outset that, in accordance with settled case-law, national courts do not have the power to declare acts of the European Union institutions invalid. The main purpose of the jurisdiction conferred on the Court by Article 267 TFEU is to ensure that European Union law is applied uniformly by national courts. That requirement of uniformity is particularly vital where the validity of an act of European Union law is in question. Differences between courts of the Member States as to the validity of acts of European Union law would be liable to jeopardise the very unity of the European Union legal order and to undermine the fundamental requirement of legal certainty (Case C-344/04 IATA and ELFAA [2006] ECR I-403, paragraph 27 and the case-law cited).
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