Case C-2/18: Judgment of the Court (Second Chamber) of 13 November 2019 (request for a preliminary ruling from the Lietuvos Respublikos Konstitucinis Teismas — Lithuania) — Lietuvos Respublikos Seimo narių grupė (Reference for a preliminary ruling — Common agricultural policy — Common organisation of the markets — Milk and milk products — Regulation (EU) No 1308/2013 — Article 148(4) — Contract for the delivery of raw milk — Free negotiation of price — Combating unfair commercial practices — Prohibition of payment of different prices to producers of raw milk belonging to a group that is formed according to the daily quantity sold, and of a reduction in price without justification)