Case C-63/18: Judgment of the Court (Fifth Chamber) of 26 September 2019 (request for a preliminary ruling from the Tribunale Amministrativo Regionale per la Lombardia — Italy) — Vitali SpA v Autostrade per l’Italia SpA (Reference for a preliminary ruling — Articles 49 and 56 TFEU — Public procurement — Directive 2014/24/EU — Article 71 — Subcontracting — National legislation limiting the possibility of subcontracting to 30 % of the total amount of the contract)