Case C-571/20: Order of the Court (Ninth Chamber) of 6 May 2021 (request for a preliminary ruling from the Tribunale di Potenza — Italy) — OM v Ministero dell’Istruzione, dell’Università e della Ricerca — MIUR, Ministero dell’Economia e delle Finanze, Presidenza del Consiglio dei Ministri, Conservatorio di Musica ‘E.R. Duni’ di Matera (Reference for a preliminary ruling — Article 53(2) of the Rules of procedure of the Court of Justice — Reference for a preliminary ruling on the validity of a provision of the FEU Treaty — Clear lack of jurisdiction of the Court — Free movement of workers — Equal treatment — Article 45 TFEU — Difference in status and salary between university teachers and teachers working in the art and music higher education national system — Purely internal situation — Manifest inadmissibility)