57The Court has already held that restricting the temporal effects of such an interpretation may be allowed only in the actual judgment ruling upon the interpretation requested. That principle guarantees the equal treatment of the Member States and of other persons subject to EU law, under that law, fulfilling, at the same time, the requirements arising from the principle of legal certainty (see, to that effect, judgments of 6 March 2007, Meilicke and Others, C‑292/04, EU:C:2007:132, paragraph 37, and of 23 October 2012, Nelson and Others, C‑581/10 and C‑629/10, EU:C:2012:657, paragraph 91).
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