Joined Cases C-573/18 and C-574/18: Judgment of the Court (Tenth Chamber) of 9 October 2019 (request for a preliminary ruling from the Bundesfinanzhof — Germany) — C GmbH & Co. KG (C-573/18), C-eG (C-574/18) v Finanzamt Z (Reference for a preliminary ruling — Sixth Council Directive 77/388/EEC — Article 11A(1)(a) — Taxable amount — Subsidy directly linked to price — Regulation (EC) No 2200/96 — Article 11(1) and Article 15 — Producer organisation having set up an operational fund — Deliveries made by the producer organisation to its members in exchange for payments not covering the entirety of the purchase price — Additional financing paid by the operational fund)