Case T-533/20: Judgment of the General Court of 14 December 2022 — Green Power Technologies v Key Digital Technologies Joint Undertaking (Arbitration clause — Seventh Framework Programme for research, technological development and demonstration activities (2007-2013) — Grant agreements — Eligible costs — OLAF report finding certain expenditure incurred to be ineligible — Recovery of sums paid — Burden of proof — Regulation (EU, Euratom) No 883/2013 — Counterclaim)