50By contrast, 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, their objectives or their general scheme that such effect must be given to them (judgments in Pokrzeptowicz-Meyer, C‑162/00, EU:C:2002:57, paragraph 49, and Commission v Freistaat Sachsen, C‑334/07 P, EU:C:2008:709, paragraph 44).
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