56Accordingly, it cannot be regarded as contrary to Community law for national law, as far as the cancellation 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 Community (see, to that effect, Deutsche Milchkontor, cited above, paragraph 30, Joined Cases C-31/91 to C-44/91 Lageder and Others [1993] ECR I-1761, paragraph 33 and Joined Cases C-80/99 to C-82/99 Flemmer and Others [2001] ECR I-7211, paragraph 60).
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