Case C-335/19: Judgment of the Court (First Chamber) of 15 October 2020 (request for a preliminary ruling from the Naczelny Sąd Administracyjny — Poland) — E. sp. z o.o. sp. k. v Minister Finansów (Reference for a preliminary ruling — Common system of value added tax (VAT) — Directive 2006/112/EC — Article 90 — Reduction of the VAT taxable amount — Total or partial non-payment of the price — Conditions imposed by national legislation for the exercise of the right to reduction — Condition that the debtor must not be the subject of insolvency or winding-up proceedings — Condition that the creditor and the debtor must be subject to VAT)