19It is also clear from settled case-law that, in the absence of Community rules governing the refund of national taxes levied though not due, 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, however, that such rules are not less favourable than those governing similar domestic actions and do not render virtually impossible or excessively difficult the exercise of rights conferred by Community law (see Reive, paragraph 5, Comet, paragraphs 13 and 16, both cited above, and, more recently, Case C-312/93 Peterbroeck v Belgian State [1995] ECR I-4599, paragraph 12).
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