Case C-292/19: Order of the Court (Sixth Chamber) of 24 October 2019 (request for a preliminary ruling from the Fővárosi Közigazgatási és Munkaügyi Bíróság — Hungary) — PORR Építési Kft. v Nemzeti Adó- és Vámhivatal Fellebbviteli Igazgatósága (Reference for a preliminary ruling — Article 99 of the Rules of Procedure of the Court of Justice — Common system of value added tax (VAT) — Taxable amount — Reduction — Directive 2006/112/EEC — Article 90 — Principle of fiscal neutrality — Debt that became irrecoverable following insolvency proceedings)