67Thus, in the absence of specific Community rules governing the matter, it is for the domestic legal system of each Member State to determine the decisive moment for the purposes of assessing the legality of the withdrawal decision, provided that the relevant national rules are not less favourable than those governing similar domestic actions (principle of equivalence) and that they do not make it practically impossible or excessively difficult to exercise rights conferred by Community law (principle of effectiveness) (see, by analogy, Case C-390/98 Banks v Coal Authority and Secretary of State for Trade and Industry [2001] ECR I-6117, paragraph 121; Case C-453/99 Courage and Crehan [2001] ECR I-6297, paragraph 29).
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