45According to the Court’s settled case-law, where a matter has been the subject of exhaustive harmonisation within the European Union, any national measure relating thereto must be assessed in the light of the provisions of that harmonising measure and not in the light of primary law (judgment of 6 December 2018, FENS, C‑305/17, EU:C:2018:986, paragraph 22 and the case-law cited).
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