30It follows from the settled case-law of the Court that, in order to ensure observance of the principles of legal certainty and the protection of legitimate expectations, the substantive rules of EU law must be interpreted as applying to situations existing before their entry into force only in so far as it clearly follows from their terms, objectives or general scheme that such effect must be given to them (see, to that effect, judgment of 14 July 2011, Bureau national interprofessionnel du Cognac, C‑4/10 and C‑27/10, EU:C:2011:484, paragraph 26 and the case-law cited).
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