Summary:
From 18 May 2026, NemHandel introduced Schematron version 1.17.2 for OIOUBL 2.1 invoice validation.This version was released as a hotfix to address an issue with the F-LIB404 VAT validation rule. The Danish Business Authority has therefore designed OIOUBL schematron version 1.17.2 to OIOUBL 2.1 as a hotfix.
Cause:
The invoice can be rejected when the VAT codes used on the invoice lines or in a document-level Allowance/Charge are not correctly represented in the invoice's TaxTotal.
This validation is performed by the NemHandel Schematron rule F-LIB404. The rule checks the VAT codes in both directions to ensure that the VAT information used throughout the invoice is correctly reflected in the TaxTotal.
Checklist:
Before proceeding with the investigation, confirm the following:
- Check the Negative Acknowledgment and confirm that the reason is “Document validation failed.” Error message: Negative Acknowledgment for Document sent by VAX 360 NemHandel [BWEIDK-0017358]. Reason: Document validation failed. Details regarding validation: Schematron validation Reject Reason Description [F-LIB404].
- Confirm that the invoice was sent through NemHandel.
- Confirm that the rejection mentions F-LIB404.
- Make sure the VAT information is consistent between the invoice lines, Allowance/Charge, and VAT summary.
- Check the VAT information in the invoice's VAT summary.
- If the invoice still fails validation, provide the original XML and the Negative Acknowledgment when contacting support.
What does the F-LIB404 error mean?
F-LIB404 is a VAT consistency validation.
It checks whether the VAT codes used:
- On invoice lines
- On document - level allowance or charges
- In the document-level TaxTotal/VAT summary
are correctly aligned
If the VAT category used in an invoice line or document-level Allowance/Charge is not correctly represented in the TaxTotal, the invoice may be rejected with F-LIB404.
Important Information:
This validation change is part of the NemHandel OIOUBL Schematron v1.17.2 update. Customers should refer to the official NemHandel documentation for the detailed technical changes and Schematron package.
Official Reference:
For more information about the NemHandel OIOUBL Schematron v1.17.2 update, please refer to the official NemHandel documentation:
OIOUBL 2.1 schematron version 1.17.2