Judgment of the Court (Fourth Chamber) of 22 April 2021.#thyssenkrupp Electrical Steel GmbH and thyssenkrupp Electrical Steel Ugo v European Commission.#Appeal – Customs union – Regulation (EU) No 952/2013 – Article 211(6) – Authorisation for inward processing of certain grain-oriented electrical steel products – Risk of adverse effect on the essential interests of EU producers – Examination of the economic conditions – Implementing Regulation (EU) 2015/2447 – Article 259 – European Commission’s conclusion on the economic conditions – Article 263 TFEU – Act not open to challenge.#Case C-572/18 P.