Case C-561/19: Judgment of the Court (Grand Chamber) of 6 October 2021 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Consorzio Italian Management, Catania Multiservizi SpA v Rete Ferroviaria Italiana SpA (Reference for a preliminary ruling — Article 267 TFEU — Scope of the obligation on national courts or tribunals of last instance to make a reference for a preliminary ruling — Exceptions to that obligation — Criteria — Question on the interpretation of EU law raised by the parties to the national proceedings after the Court has given a preliminary ruling in those proceedings — Failure to state the reasons justifying the need for an answer to the questions referred for a preliminary ruling — Partial inadmissibility of the request for a preliminary ruling)