35In that regard, the Court of Justice has found, while it is perfectly in order for modification of the application to be subject to certain formal requirements, such formal requirements do not apply for their own sake but are, on the contrary, intended to ensure the adversarial nature of proceedings and the sound administration of justice (judgment of 9 November 2017, HX v Council, C‑423/16 P, EU:C:2017:848, paragraph 23).
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