errorcountryAUTCIUS-AT (Austria)

AT-R-002:Austrian UID number format invalid

Fix: This requires user input to resolve. Review the relevant cbc: and cac: elements in your Invoice XML and provide the correct value. (AT-R-002). Provide the required value in the free validator.

Austrian VAT number must be ATU + 8 digits.

Severity
Fatal
Rule set
CIUS-AT (Austria)
Country
AUT
Fix type
INPUT REQUIRED

Engine Classification

Business data required · Explicit input workflow · No assumptions made

Required input: Austrian VAT Number (UID)

What is AT-R-002?

AT-R-002 is a fatal validation rule defined in the CIUS-AT (Austria) specification (AUT national rules). It validates the CompanyID element under 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: //cac:PartyTaxScheme/cbc:CompanyID

Fix this error

Why This Error Matters

Austrian UID required for VAT compliance.

AT-R-002 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.

Validator Behavior

  • ·Causes invoice rejection
  • ·Error returned: AT-R-002
  • ·Specification: CIUS-AT (Austria)

How to Fix It

1.

Check format

Must be ATU followed by 8 digits

2.

Verify UID

Check with Austrian business register

Before / After

Failing XML
<Invoice>
  <!-- Issue: Austrian VAT number must be ATU + 8 digits -->
</Invoice>
Corrected XML
<Invoice>
  <!-- Issue resolved per CIUS-AT (Austria) -->
</Invoice>

Technical Reference

XPathXPath: //cac:PartyTaxScheme/cbc:CompanyID
SpecCIUS-AT (Austria)
StrategyRequires user to provide correct Austrian UID number format (ATU + 8 digits)

Common Causes

  • ·Wrong format
  • ·Missing ATU prefix
  • ·Wrong digit count

Seeing this in production? The API handles AT-R-002 automatically. See the fix response →

Frequently Asked Questions

Austrian VAT number must be ATU + 8 digits.

This requires user input to resolve. Review the relevant cbc: and cac: elements in your Invoice XML and provide the correct value. (AT-R-002). Invoice Navigator detects this error and prompts for the required business data before applying a safe fix.

Yes, AT-R-002 is a critical error that must be fixed.

Related Errors

AT-01Austrian sellers should include UID numberAT-R-003Austrian postal code format

Related Content

Errors
Austrian sellers should include UID numberAustrian postal code format
Answers
What are the differences between e-invoice formats?Which EU countries have e-invoicing mandates and what are the deadlines?

Last updated: 3 March 2026

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