Judgment of the General Court (Ninth Chamber) of 14 April 2021.#SGI Studio Galli Ingegneria Srl v European Commission.#Arbitration clause – Seventh Framework Programme for research, technological development and demonstration activities (2007-2013) – Grant agreement – The MARSOL Project – Eligible costs – OLAF investigation report finding certain expenses incurred to be ineligible – Repayment of sums paid – Burden of proof – Principle of good faith – Right to be heard – Principle of sound administration – Rights of the defence – Proportionality.#Case T-285/19.