54Consequently, it is only quite exceptionally that the Court may, in application of the general principle of legal certainty inherent in the European Union legal order, be moved to restrict the opportunity to rely on a provision which it has interpreted. 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 (judgments in Skov and Bilka, C‑402/03, EU:C:2006:6, paragraph 51, and Kalinchev, C‑2/09, EU:C:2010:312, paragraph 50).
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