29As regards the fifth plea in law, alleging that the contested decision was vitiated by a failure to state reasons, it should be noted that a breach of the duty to state reasons goes to an issue of infringement of essential procedural requirements and involves a matter of public policy, which must be raised by the EU judicature of its own motion and does not relate to the substantive legality of the contested decision (see, to that effect, judgment of 2 April 1998, Commission v Sytraval and Brink’s France, C‑367/95 P, EU:C:1998:154, paragraphs 67 to 72).