Judgment of the General Court (Fourth Chamber) of 14 December 2022.#Green Power Technologies, SL 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