Case C-274/19 P: Judgment of the Court (Tenth Chamber) of 22 October 2020 — Ethniko Kentro Erevnas kai Technologikis Anaptyxis (EKETA) v European Commission (Appeal — Arbitration clause — Regulation (EC, Euratom) No 1605/2002 — Regulation (EC, Euratom) No 2342/2002 — Regulation (EC) No 1906/2006 — Actibio grant agreement — Actibio project — Seventh framework programme — Eligible costs — Conflict of interests — Burden of proof — Time sheets — Audit report — Probative value — Principle of proportionality)