45It is only quite exceptionally that the Court may, in application of the general principle of legal certainty inherent in the EU 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 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 (judgment of 14 March 2019, Skanska Industrial Solutions and Others, C‑724/17, EU:C:2019:204, paragraph 56 and the case-law cited).
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