Judgment of the Court (First Chamber) of 8 May 2019.#A-PACK CZ s.r.o. v Odvolací finanční ředitelství.#Request for a preliminary ruling from the Nejvyšší správní soud.#Reference for a preliminary ruling — Common system of value added tax (VAT) — Directive 2006/112/EC — Articles 90 and 273 — Total or partial non-payment, by the debtor, of a sum due to the taxable person in respect of a transaction subject to VAT — Taxable amount — Reduction — Principles of fiscal neutrality and proportionality.#Case C-127/18.