Case C-640/19: Judgment of the Court (Sixth Chamber) of 4 February 2021 (request for a preliminary ruling from the Tribunale amministrativo regionale per il Lazio — Italy) — Azienda Agricola Ambrosi Nicola Giuseppe and Others v Agenzia per le Erogazioni in Agricoltura (AGEA), Ministero delle Politiche agricole e forestali (Reference for a preliminary ruling — Agriculture — Common organisation of markets — Regulation (EC) No 1234/2007 — Milk quotas — Surplus levies — Milk used to produce cheeses with a protected designation of origin (PDO) intended for export to non-EU countries — Exclusion — Article 32(a), Article 39(1) and (2)(a), Article 40(2) and Article 41(b) TFEU — Principles of proportionality and non-discrimination — Validity)