Revision 1.24 of the AES Export Declaration Web Services guide is published for the exchange of information between Operators and Customs in the new AES (Automated Export System). This guide contains the messages of the external domain (communication between the Economic Operator and the Tax Agency) of the national component of the Automated Export Declaration System AES, as well as the adaptations that may be necessary to improve the National Export Systems in line with the Union Customs Code (UCC).

In this new review, there are changes resulting from the adaptation of the transit declaration to the EU-UK Agreement concerning Gibraltar made public on 26 February 2026.