Revision 3.16 of the Technical Import Guide is published CAU and the new revision 4.6 of the UCC Rules and Conditions for information exchange between Operators and Customs in the new UCC Import System (H1). This guide includes the messages from the external domain (communication between the Economic Operator and the Tax Agency) of the national component of the Automated Import Declaration System (H1), as well as any adaptations that may be necessary to improve the National Transit Systems in line with the Union Customs Code (UCC).

In this new revision, apart from changes in certain rules, the changes resulting from the adaptation of the Import declaration to the Agreement are mainly explained. EU - United Kingdom in relation to Gibraltar made public on 26 February 2026.

It can currently be tested in the pre-production environment and from April 10th in the production environment.