Judgment of the General Court (Fifth Chamber) of 5 July 2023.#Clean Aviation Joint Undertaking v NG.#Arbitration clause – Seventh Framework Programme for the activities of research and development (FP7) – Grant agreements – Lack of supporting documents and non-compliance with the contractual requirements for part of the declared expenses – Repayment of the sums advanced – Jurisdiction of the General Court – Admissibility – Eligible costs – Burden of proof – Interest on arrears.#Cases T-649/20, T-721/20 and T-767/20.