30It must be borne in mind that the principle of legal certainty is a fundamental principle of Community law which requires, in particular, that rules should be clear and precise, so that individuals may be able to ascertain unequivocally what their rights and obligations are and may take steps accordingly (see Case 169/80 Gondrand Frères and Garancini [1981] ECR 1931 and Case C-143/93 Van Es Douane Agenten [1996] ECR I-431, paragraph 27).
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