17It follows that it is for the domestic legal system of each Member State to lay down such a procedural rule, provided, first, that the rule is not less favourable than those governing similar domestic actions (principle of equivalence) and, second, that it does not render in practice impossible or excessively difficult the exercise of rights conferred by European Union law (principle of effectiveness) (see, to that effect, Case C-228/96 Aprile [1998] ECR I-7141, paragraph 18 and case-law cited).
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