Please note that there is an External Testing Portal in pre-production accessible from this link . It contains a section dedicated to Declarations CAU Temporary Storage ( G3v2, G4 and G5v2 ) which contains a series of queries that will be useful for the pre-production testing of economic operators' computer systems linked to the G4. You can access it from here link.

Some of them, such as the G4 query of items by location and the G4 query of items by MRN and status, have recently been published on the testing portal and will soon be published on the electronic headquarters in the production environment.

Subscribe to the Customs News RSS channel on the AEAT portal to be aware of future communications.