33Furthermore, 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 follows clearly from their terms, their objectives or their general scheme that such effect must be given to them (judgment of 6 October 2015, Commission v Andersen, C‑303/13 P, EU:C:2015:647, paragraph 50 and the case-law cited).
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