47At the outset, it must be borne in mind that it is settled case-law that it cannot be regarded as contrary to European Union law for national law, as far as the withdrawal of administrative measures and the recovery of sums wrongly paid by public authorities are concerned, to take into account, in addition to the principle of legality, the principles of the protection of legitimate expectations and legal certainty, since those principles form part of the legal order of the European Union. Those principles must be observed all the more strictly in the case of rules liable to have financial consequences (see Joined Cases C-383/06 to C-385/06 Vereniging Nationaal Overlegorgaan Sociale Werkvoorziening and Others [2008] ECR I-1561, paragraph 52 and case-law cited).
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