Error Guide

🇧🇪 BE-03: Belgian VAT numbers must be in correct format in Belgium

WarningMandatoryManual Fix

Belgian VAT numbers must be in correct format. This validation rule ensures Invoice compliance with CIUS-BE (Belgium).

Quick Facts

Severity

Warning

Ruleset

CIUS-BE (Belgium)

Mandate

B2B Mandatory

Fix Type

Manual

Why This Matters in Belgium

Belgium requires e-invoicing using Peppol BIS Billing 3.0 (UBL). This warning may cause processing delays in Belgium. While not immediately rejected, it should be fixed for compliance.

Invoice Navigator covers 89 Peppol BIS 3.0.17 rules for Belgium.

How to Fix BE-03

1
Identify the issue in your invoice
Belgian VAT numbers must be in correct format. This validation rule ensures Invoice compliance with CIUS-BE (Belgium).
2
Correct this in your invoicing software
Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per CIUS-BE (Belgium) (BE-03).
3
Re-export and validate
Generate a new invoice export from your accounting system and re-validate to confirm BE-03 is resolved.

Example: Before & After

Before (invalid)

<Invoice>
  <!-- Issue: Belgian VAT numbers must be in correct format -->
</Invoice>

After (fixed)

<Invoice>
  <!-- Issue resolved per CIUS-BE (Belgium) -->
</Invoice>

Belgium E-Invoicing Requirements

Phase

Status

Scope

B2G

Live (Nov 2022)

All federal government suppliers

B2B

Live (Jan 2026)

All Belgian VAT-registered businesses

Fix BE-03 automatically

Upload your invoice and let Invoice Navigator auto-remediate this error.

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