errorAUTpeppol-bis-3

`BR-AT-01`:Austrian UID number required

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

Severity

Fatal

Rule set

peppol-bis-3

Country

AUT

Fix type

INPUT REQUIRED

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 non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.

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

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Why This Error Matters

Austrian UID is required for VAT deduction by Austrian buyers.

BR-AT-01 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.

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.

Before

<!-- Missing or empty element triggers cbc:CompanyID error -->
<cbc:CompanyID></cbc:CompanyID>

After

<!-- Provide the required value -->
<cbc:CompanyID>VALID_VALUE</cbc:CompanyID>

Technical Reference

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

Specpeppol-bis-3

Code 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

Austrian invoicing systems

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.

Resolve BR-AT-01 with Guided Input

The compliance engine detects this error and prompts for the required business data before applying a safe, auditable fix.

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BR-AT-01:Austrian UID number required