a) Technical documentation that has changed.

1. Technical Import Guide CAU v3.14

2. Rules and Conditions for Importation of CAU V 4.4 

3. Import scenarios adapted to CAU V3.2        

4. Additional Information Import CAU GENERAL V3.19           

5. Additional Information Importation CAU RR.EE. V1.2

It can also be seen in:

HEADQUARTERS: Tax Agency: Technical guides - Presentation of the SAD (Single Administrative Document) 

Web Services (agenciatributaria.gob.es). During these days.

b) Definitive closure of the current PreCau duo.

See news published on June 4, 2024 (H1 publication of technical documentation andcalendar). Here the day 10/14/2025 is detailed as the day of thedefinitive and irreversible closureof the current PreCau duo as regardsupon registration of newfull or simplified declarations.