errorAUTpeppol-bis-3

BR-AT-01:Austrian UID number required

Austrian invoices must include the UID-Nummer (VAT ID) in ATU + 8 digits format.

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Why This Error Matters

Austrian UID is required for VAT deduction by Austrian buyers.

How to Fix It

1

Get UID

Format: ATU + 8 digits

2

Add to invoice

In PartyTaxScheme/CompanyID

3

Validate

Check with Austrian VAT validation service

Code Example

<cac:PartyTaxScheme>
  <cbc:CompanyID>ATU12345678</cbc:CompanyID>
  <cac:TaxScheme>
    <cbc:ID>VAT</cbc:ID>
  </cac:TaxScheme>
</cac:PartyTaxScheme>

Technical Details

XPath: /Invoice/cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme/cbc:CompanyID

Common Causes

  • Missing ATU prefix
  • Wrong length
  • Invalid UID

Commonly Seen In

Austrian invoicing systems

Frequently Asked Questions

Austrian invoices must include the UID-Nummer (VAT ID) in ATU + 8 digits format.
Add Austrian UID number. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, BR-AT-01 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.
Many instances of BR-AT-01 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including austrian uid number required.
BR-AT-01 is commonly seen in exports from Austrian invoicing systems. These software packages sometimes generate invoices that need adjustment to meet full compliance standards.

Related Errors

BR-29

Invoice period end date before start date

Last updated: 18 January 2026

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