Case T-716/19: Judgment of the General Court of 14 July 2021 — Interpipe Niko Tube and Interpipe Nizhnedneprovsky Tube Rolling Plant v Commission (Dumping — Imports of certain seamless pipes and tubes, of iron or steel, originating in Russia and Ukraine — Interim review — Calculation of the normal value — Selling, general and administrative costs — Sales between related companies — Ordinary course of trade — Single economic entity — Article 2(3), (4) and (6) of Regulation (EU) 2016/1036 — Export price — Adjustment — Functions similar to those of an agent working on a commission basis — Article 2(10)(i) of Regulation 2016/1036 — Manifest error of assessment — Methodology different from that used in a previous investigation — Article 11(9) of Regulation 2016/1036 — Legitimate expectations — Rights of the defence)