26In that regard, 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, inter alia, Falck and Acciaierie di Bolzano v Commission, paragraph 119; Bavaria, paragraph 40; and Case C-369/09 P ISD Polska and Others v Commission [2011] ECR I-2011, paragraph 98).
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