Case C-497/20: Judgment of the Court (Grand Chamber) of 21 December 2021 (request for a preliminary ruling from the Corte suprema di cassazione — Italy) — Randstad Italia SpA v Umana SpA, Azienda USL Valle d’Aosta, IN. VA SpA, Synergie Italia agenzia per il Lavoro SpA (Reference for a preliminary ruling — Second subparagraph of Article 19(1) TEU — Obligation of Member States to provide remedies sufficient to ensure effective legal protection in the fields covered by Union law — Public procurement — Directive 89/665/EEC — Article 1(1) and (3) — Article 47 of the Charter of Fundamental Rights of the European Union — Judgment of a Member State’s highest administrative court declaring inadmissible, in breach of the case-law of the Court of Justice, an action brought by a tenderer excluded from a public procurement procedure — No remedy against that judgment before the highest court in that Member State’s judicial order — Principles of effectiveness and equivalence)