Judgment_paragraph 51 · Skov Æg v Bilka Lavprisvarehus A/S and Bilka Lavprisvarehus A/S v Jette Mikkelsen and Michael Due Nielsen (C-402/03)

51It is only exceptionally that the Court may, in application of the general principle of legal certainty inherent in the Community legal order, be moved to restrict for any person concerned the opportunity of relying on a provision which it has interpreted with a view to calling in 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-57/93 Vroege [1994] ECR I-4541, paragraph 21, and Case C-372/98 Cooke [2000] ECR I-8683, paragraph 42).