Case T-408/18: Judgment of the General Court of 23 September 2020 — Aristoteleio Panepistimio Thessalonikis v EACEA (Arbitration clause — Grant agreement entered into under Erasmus Mundus action programme No 3 for the promotion of higher education — Grant agreement entered into under the programme for lifelong learning — Eligible costs — Debit notes — Repayment of part of the sums advanced — Contractual liability)