49With regard in particular to a complaint concerning the implementation of a national provision the Court has held that proof of a Member State's failure to fulfil its obligations requires production of evidence different from that usually taken into account in an action for failure to fulfil obligations concerning solely the terms of a national provision, and that in those circumstances the failure to fulfil obligations can be established only by means of sufficiently documented and detailed proof of the alleged practice of the national administration and/or courts, for which the Member State concerned is answerable (Case C-287/03 Commission v Belgium, paragraph 28).
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