43Even if there is no general obligation, for the Member States, to establish whether the legislation of the other Member States falls within the scope ratione materiae of Regulations Nos 1408/71 and 883/2004, a national court, seised of an action relating to such a law or such a regulation, can always be called upon to examine the classification of the scheme at issue in the case before it and, if necessary, to refer a question relating to that classification to the Court of Justice for a preliminary ruling.
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