36Thus, if the authorities of the Member State concerned, which is participating in the exercise of legislative power, are under a duty to amend national provisions which have been the subject of a judgment establishing a failure to fulfil obligations so as to make them conform with the requirements of EU law, the courts of that Member State, for their part, have an obligation to ensure, when performing their duties, that the Court’s judgment is complied with, which means, in particular, that it is the duty of the national court, by virtue of the authority attaching to that judgment, to take account, if need be, of the elements of law established by that judgment in order to determine the scope of the provisions of EU law which it has the task of applying (see, to that effect, judgment of 14 December 1982, Waterkeyn and Others, 314/81 to 316/81 and 83/82, EU:C:1982:430, paragraphs 14 and 15).