Case C-273/19 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 — Article 52 — Regulation (EC) No 2321/2002 — Decision No 1513/2002/EC — Grant agreement — Sensation project — Sixth framework programme — Eligible costs — Conflict of interests — Burden of proof — Time sheets — Audit report — Probative value — Principle of good financial management — Principle of proportionality)