errorAUTCIUS-AT (Austria)

AT-R-002:Austrian UID number format invalid

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 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: //cac:PartyTaxScheme/cbc:CompanyID

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Why This Error Matters

Austrian UID required for VAT compliance.

AT-R-002 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
  • ·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.

Use format ATU + 8 digits. Invoice Navigator can help identify and fix this issue.

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

Related Errors

AT-01

Austrian sellers should include UID number

AT-R-003

Austrian postal code format

Last updated: 27 February 2026

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The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.

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