28With regard in particular to an action concerning the implementation of a national provision and as the Advocate General observes in points 41 and 43 of his Opinion, proof of a Member States 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. 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.
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