Engine Classification
Financial or legal field · Modification blocked by policy
Reason: NAV Online Invoice reporting requires a registered technical user (technikai felhasználó) with valid credentials. Register at onlineszamla.nav.gov.hu and configure the credentials in your invoicing software.
What is HU-R-003?
HU-R-003 is a fatal validation rule defined in the nav specification (HUN national rules). It validates the NAV API authentication element in the UBL invoice XML.
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Target path: NAV API authentication
Why This Error Matters
Technical user enables API access.
HU-R-003 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: HU-R-003
- ·Specification: nav
How to Fix It
Register user
In NAV Online Invoice portal
Get credentials
API key and technical user
Configure system
Set up API connection
XML Example
Generic example based on the rule's target XPath. Your actual XML structure may differ.
<!-- Triggers validation error --> <NAV API authentication></NAV API authentication>
<!-- Corrected --> <NAV API authentication>VALID_VALUE</NAV API authentication>
Technical Reference
NAV API authenticationCommon Causes
- ·No technical user
- ·Invalid credentials
Seeing this in production? The API handles HU-R-003 automatically. See the fix response →
Frequently Asked Questions
NAV reporting requires registered technical user.
Register technical user in NAV Online Invoice. This error involves a protected field — Invoice Navigator flags it in your pipeline so your team can correct it at the source.
Yes, HU-R-003 is a critical error that must be fixed.
Related Errors
Related Content
Last updated: 3 March 2026
Validate your invoice
Drop your XML here to check for HU-R-003
Detect HU-R-003 before submission
This error involves a financial field that can't be auto-modified. We'll flag it with a clear diagnosis so you can fix it at the source.