49According to settled case-law, in order to ensure observance of the principles of legal certainty and the protection of legitimate expectations, the substantive rules of Community 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 (see, in particular, Case 21/81 Bout [1982] ECR 381, paragraph 13, and Case C-34/92 GruSa Fleisch [1993] ECR I-4147, paragraph 22).
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