41It is only quite exceptionally that the Court may, in application of the general principle of legal certainty inherent in the legal order of the European Union, decide to restrict for any person concerned the opportunity of relying on a provision which it has interpreted with a view to calling into question legal relationships established in good faith. Two essential criteria must be fulfilled before such a limitation can be imposed, namely, that those concerned should have acted in good faith and that there should be a risk of serious difficulties (see, inter alia, Case C-402/03 Skov and Bilka [2006] ECR I-199, paragraph 51; Case C-2/09 Kalinchev [2010] ECR I-4939, paragraph 50; and Santander Asset Management SGIIC and Others, paragraph 59).
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