50The Court has, however, made it clear that those rules cannot be less favourable than those governing rights which originate in domestic law (principle of equivalence) and that they cannot render virtually impossible or excessively difficult the exercise of rights conferred by Community law (principle of effectiveness) (see Rewe, cited above, paragraph 5, Case C-261/95 Palmisani [1997] ECR I-4025, paragraph 27, and Case C-231/96 Edis [1998] ECR I-4951, paragraph 34). As the Advocate General has observed in points 38 and 64 of her Opinion, the principle of effectiveness must lead the national court to apply the detailed procedural rules laid down by domestic law only in so far as they do not compromise the raison d'être and objective of the Regulation.
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