Judgment of the General Court (Fifth Chamber) of 24 March 2021.#Jean-Luc Bennahmias v European Parliament.#Institutional law – Rules governing the payment of expenses and allowances to Members of the European Parliament – Parliamentary assistance allowance – Recovery of sums unduly paid – Burden of proof – Obligation to state reasons – Error of law – Error of fact – Proportionality.#Case T-798/19.