24However, acknowledging that a provision of substantive law has such an effect must not undermine the fundamental principles of the Community, in particular the principles of legal certainty and the protection of legitimate expectations, by virtue of which the effect of Community legislation must be clear and predictable for those who are subject to it (see, to that effect, Salumi and Others, paragraph 10; Case 21/81 Bout [1982] ECR 381, paragraph 13; GruSa Fleisch, paragraph 22; and Case C-376/02 ‘Goed Wonen’ [2005] ECR I-3445, paragraph 33).
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