The Sinief Agreement (Ajuste Sinief 12/21) postponed the implementation of codes used in e-invoices for classification of transactions (eg. taxed, partially taxed, exempt, non-taxed etc), and identification of taxation regime and type of supply (eg: sales of gas to final customers). Previously expected to be enforced in 1 Jan 2022, the Agreement effectively impacts the Sinief Agreement 11/19 delaying the entry into force until 3 April 2023.