85In the absence of Community rules on the restitution of national charges that have been improperly levied, it is for the domestic legal system of each Member State to designate the courts and tribunals having jurisdiction and to lay down the detailed procedural rules governing actions for safeguarding rights which individuals derive from Community law, provided, first, that such rules are not less favourable than those governing similar domestic actions (principle of equivalence) and, second, that they do not render practically impossible or excessively difficult the exercise of rights conferred by Community law (principle of effectiveness) (see, in particular, Case C-231/96 Edis [1998] ECR I-4951 paragraphs 19 and 34, Case C-260/96 Spac [1998] ECR I-4997, paragraph 18 Case C-228/96 Aprile [1998] ECR I-7141, paragraph 18, and Dilexport, paragraph 25).
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