Case C-424/19: Judgment of the Court (Sixth Chamber) of 16 July 2020 (request for a preliminary ruling from the Curtea de Apel București — Romania) — Cabinet de avocat UR v Administraţia Sector 3 a Finanţelor Publice prin Direcţia Generală Regională a Finanţelor Publice Bucureşti, Administraţia Sector 3 a Finanţelor Publice, MJ, NK (Reference for a preliminary ruling — Directive 2006/112/EC — Value added tax (VAT) — Article 9(1) — Concept of ‘taxable person’ — Person practising the profession of lawyer — Final judicial decision — Principle of res judicata — Scope of that principle if that decision is incompatible with EU law)