24As regards, moreover, the obligation on the referring court to set out the reasons that led it to raise the question of the validity of Article 20 of Directive 2014/40, it does indeed follow from the spirit of cooperation which must prevail in the operation of the preliminary reference procedure that it is essential that the national court sets out in its order for reference the precise reasons why it considers a reply to its questions concerning the interpretation or validity of certain provisions of EU law to be necessary to enable it to give judgment (see to that effect, inter alia, judgments in Bertini and Others, 98/85, 162/85 and 258/85, EU:C:1986:246, paragraph 6; ABNA and Others, C‑453/03, C‑11/04, C‑12/04 and C‑194/04, EU:C:2005:741, paragraph 46; and IATA and ELFAA, C‑344/04, EU:C:2006:10, paragraph 31).
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