The single flat-rate technical assistance operation, established pursuant to Delegated Regulation (EU) 2019/1867, which entered into force on 09 November 2019, corresponds to the programming, under the Programme, of expenditure on technical assistance, declared on a flat-rate basis to the European Commission. This single flat-rate technical assistance operation runs from 26/03/2020 to 31/12/2023. This single flat-rate technical assistance operation cannot be retroactive and must run until the end of the programming.