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Integration Guide

Wolters Kluwer

a3 Software

¿Usas a3 Software? Valida facturas para FACe y SII. Asesorías fiscales, prepárate para 2026.

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Supported E-Invoice Formats

FormatSupport Level
Facturae 3.2.2Native Support
SIINative Support

Common Validation Errors

These errors are frequently encountered when validating e-invoices from a3 Software. Click on any error to see the fix.

FACE-001Common

NIF/CIF format invalid

Advisory firms handle many clients; NIF validation across client databases is essential.

View fix
FACE-004Occasional

SII deadline exceeded

Operation date must be within valid period for SII reporting (4 days for SII subjects).

View fix

About a3 Software

a3 Software de Wolters Kluwer es una solución líder para asesorías y PYME con integración FACe y SII.

Validate Your Invoice

Export your invoice from a3 Software and validate it against Peppol and EN16931 rules.

Validate Free

How to Validate

  1. 1Export your invoice as UBL or XML from a3 Software
  2. 2Upload the file to our validator
  3. 3Review errors and warnings with suggested fixes
  4. 4Fix issues in a3 Software and re-export

Resources

Browse All ErrorsAPI DocumentationOther Software Guides