63It is ultimately for the national court, which has sole jurisdiction to assess the facts of the dispute in the main proceedings, to determine whether a measure satisfies those two requirements. However, in order to provide answers of use to the referring court, the Court may provide guidance based on the documents relating to the main proceedings and on the written and oral observations which have been submitted to it, in order to enable that court to give judgment (see, to that effect, judgment of 1 October 2015, Trijber and Harmsen, C‑340/14 and C‑341/14, EU:C:2015:641, paragraph 70).
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