HU-R-001:Hungarian tax number required
Hungarian invoices must include adószám (tax number).
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: Hungarian Tax Number (Adószám)
What is HU-R-001?
HU-R-001 is a fatal validation rule defined in the nav specification (HUN 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
Why This Error Matters
Hungarian tax identification required.
HU-R-001 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: HU-R-001
- ·Specification: nav
How to Fix It
Get tax number
11-digit Hungarian tax number
Add to invoice
HU prefix + number
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: //cac:PartyTaxScheme/cbc:CompanyIDCommon Causes
- ·Missing tax number
- ·Wrong format
Seeing this in production? The API handles HU-R-001 automatically. See the fix response →
Frequently Asked Questions
Hungarian invoices must include adószám (tax number).
Add HU + tax number (8+1+2 digits). Invoice Navigator can help identify and fix this issue.
Yes, HU-R-001 is a critical error that must be fixed.
Related Errors
Last updated: 27 February 2026
Handle HU-R-001 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.