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Warning

UBL-CR-641: A VAT category does not belong on a discount inside the line price

In short

Warning: worth checking.

UBL-CR-641 means a cac:AllowanceCharge block inside an invoice or credit note line's price contains a tax category (cac:TaxCategory). Remove that nested block. Keep the line's VAT information in cac:Item/cac:ClassifiedTaxCategory.

On this page

What it means

The rule checks every cac:Price/cac:AllowanceCharge on invoice and credit note lines for cac:TaxCategory. It does not check cac:Item/cac:ClassifiedTaxCategory, which holds the line's VAT category (BT-151) and, where applicable, VAT rate (BT-152).

Why it matters

EN 16931 assigns VAT information to the line's item rather than a separate tax category within its price discount.

How to fix it

Remove cac:TaxCategory from cac:AllowanceCharge inside cac:Price in each affected cac:InvoiceLine or cac:CreditNoteLine. Keep cac:ClassifiedTaxCategory inside cac:Item and review the line's VAT category (BT-151) and any applicable VAT rate (BT-152). Export the corrected file and recheck it.

Once the file is corrected, check it again for free: Validate an invoice against EN 16931

Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice

The rule as published

A UBL invoice should not include the InvoiceLine Item Price AllowanceCharge TaxCategory

Where this rule applies

Rule set Version
EN 16931 (UBL) 1.3.17
EN 16931 (UBL credit note) 1.3.17
XRechnung 3.0 (UBL) 3.0.2
XRechnung 3.0 (UBL credit note) 3.0.2
Peppol BIS Billing 3.0 (invoice) 2026.5
Peppol BIS Billing 3.0 (credit note) 2026.5
SI-UBL 2.0 / NLCIUS (invoice) 2.0.3.13
SI-UBL 2.0 / NLCIUS (credit note) 2.0.3.13
France CTC (UBL invoice) 1.4.0-04
France CTC (UBL credit note) 1.4.0-04
CIUS-RO UBL Invoice 1.0.9 1.0.9
CIUS-RO UBL Credit Note 1.0.9 1.0.9
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether UBL-CR-641 still fails, and which other rules do.

Updated 6 November 2026