45National courts before which an action against such a national measure has been brought are also under such an obligation, and, in that regard, it should be recalled that the detailed procedural rules applicable to such actions which may be brought against such ‘plans’ or ‘programmes’ are a matter for the domestic legal order of each Member State, under the principle of procedural autonomy of the Member States, provided that they are not less favourable than those governing similar domestic situations (principle of equivalence) and that they do not render impossible in practice or excessively difficult the exercise of rights conferred by the European Union legal order (principle of effectiveness) (see Wells, paragraph 67 and the case-law cited).
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