Case C-72/21: Judgment of the Court (Eight Chamber) of 28 April 2022 (request for a preliminary ruling from the Augstākā tiesa (Senāts) — Latvia) — SIA ‘PRODEX’ v Valsts ieņēmumu dienests (Reference for a preliminary ruling — Customs union — Common Customs Tariff — Combined Nomenclature — Tariff headings — Subheading 4418 20 — Scope — Doors and their frames and thresholds — MDF panels and mouldings — First sentence of general rule 2(a) for the interpretation of the Combined Nomenclature — Incomplete or unfinished article — Concept)