34It should be recalled at the outset that in the absence of Community rules on the repayment of national charges wrongly 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 (the principle of equivalence) and, second, that they do not render virtually impossible or excessively difficult the exercise of rights conferred by Community law (the principle of effectiveness) (see, inter alia, Case C-228/96 Aprile [1998] ECR I-7141, paragraph 18, and the judgments cited above in Dilexport, paragraph 25, and Metallgesellschaft, paragraph 85).
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