Case T-671/18 and T-140/19: Judgment of the General Court of 20 October 2021 — ZU v Commission (Civil service — Officials — Transfer in the interests of the service — Article 12a of the Staff Regulations — Psychological harassment — Article 25 of the Staff Regulations — Obligation to state reasons — Rights of the defence and the right to be heard — Manifest error of assessment — Principle of sound administration and duty to have regard for the welfare of staff — Article 22a of the Staff Regulations — Misuse of powers — Article 24 of the Staff Regulations — Request for assistance — Refusal of the request — 2017 appraisal exercise — Appraisal report — 2018 promotion exercise — Proposed non-promotion — Liability)