45In that regard, and since there is no Community legislation on the subject, it is for the domestic legal system of each Member State to designate the courts having jurisdiction and to determine the detailed procedural rules governing actions at law intended to safeguard the rights which individuals derive from Community law, provided, firstly, that those rules are not less favourable than those governing rights which originate in domestic law (principle of equivalence) and, secondly, that they do not render impossible or excessively difficult in practice the exercise of rights conferred by the Community legal order (principle of effectiveness) (see Case C-300/04 Eman and Sevinger [2006] ECR I-8055, paragraph 67, and Joined Cases C-392/04 and C-422/04 i-21 Germany and Arcor [2006] ECR I-8559, paragraph 57).
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