Case T-755/17: Judgment of the General Court of 20 September 2019 –Germany v ECHA (REACH — Evaluation of substances — Benpat — Persistence — ECHA decision requesting further information — Article 51(6) of Regulation (EC) No 1907/2006 — Action brought before the Board of Appeal — Task of the Board of Appeal — Adversarial procedure — Nature of review — Intensity of review — Powers of the Board of Appeal — Article 93(3) of Regulation No 1907/2006 — Conferral of powers on EU agencies — Principle of conferral — Principle of subsidiarity — Proportionality — Obligation to state reasons)