BR-AT-01:Austrian UID number required
Fix: Add Austrian UID number. Provide the required value in the free validator.
Austrian invoices must include the UID-Nummer (VAT ID) in ATU + 8 digits format.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: Austrian UID Number (UID-Nummer)
What is BR-AT-01?
BR-AT-01 is a fatal validation rule defined in the peppol-bis-3 specification (AUT national rules). It validates the CompanyID element under Party > PartyTaxScheme in the UBL invoice XML.
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Target path: XPath: /Invoice/cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme/cbc:CompanyID
Why This Error Matters
Austrian UID is required for VAT deduction by Austrian buyers.
BR-AT-01 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.
Validator Behavior
- ·Causes invoice rejection
- ·Rejected by PEPPOL Access Points
- ·Error returned: BR-AT-01
- ·Specification: peppol-bis-3
How to Fix It
Get UID
Format: ATU + 8 digits
Add to invoice
In PartyTaxScheme/CompanyID
Validate
Check with Austrian VAT validation service
XML Example
Generic example based on the rule's target XPath. Your actual XML structure may differ.
<!-- Missing or empty element triggers cbc:CompanyID error --> <cbc:CompanyID></cbc:CompanyID>
<!-- Provide the required value --> <cbc:CompanyID>VALID_VALUE</cbc:CompanyID>
Technical Reference
XPath: /Invoice/cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme/cbc:CompanyIDCode Example
<cac:PartyTaxScheme>
<cbc:CompanyID>ATU12345678</cbc:CompanyID>
<cac:TaxScheme>
<cbc:ID>VAT</cbc:ID>
</cac:TaxScheme>
</cac:PartyTaxScheme>Common Causes
- ·Missing ATU prefix
- ·Wrong length
- ·Invalid UID
Seeing this in production? The API handles BR-AT-01 automatically. See the fix response →
Commonly Seen In
Frequently Asked Questions
Austrian invoices must include the UID-Nummer (VAT ID) in ATU + 8 digits format.
Add Austrian UID number. Invoice Navigator detects this error and prompts for the required business data before applying a safe fix.
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.
BR-AT-01 requires specific business data to resolve. Invoice Navigator detects the error and guides you through providing the needed information, then applies the fix with full audit documentation.
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.
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Last updated: 3 March 2026
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