Judgment of the Court (Sixth Chamber) of 7 March 2019.#Suez II Water Technologies & Solutions Portugal Unipessoal Lda v Fazenda Pública.#Request for a preliminary ruling from the Supremo Tribunal Administrativo.#Reference for a preliminary ruling — Customs union — Regulation (EEC) No 2913/92 — Article 37 — Community Customs Code — Regulation (EEC) No 2454/93 — Article 313 — Customs status of goods — Presumption of the Community status of goods.#Case C-643/17.