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Warning

UBL-CR-634: Discount reason text does not belong inside the line price

In short

Warning: worth checking.

UBL-CR-634 means a cac:AllowanceCharge block inside an invoice or credit note line's price contains a written reason (cbc:AllowanceChargeReason). Remove the text from that block. If you need to keep the explanation, use the line note.

On this page

What it means

The rule checks every cac:Price/cac:AllowanceCharge on invoice and credit note lines for cbc:AllowanceChargeReason. The price discount amount (BT-147) and price before the discount (BT-148) are separate fields. A discount directly under the line is outside this check and can have reason text (BT-139).

Why it matters

EN 16931 does not define reason text within a price discount; a line-level discount has a separate reason field.

How to fix it

Remove cbc:AllowanceChargeReason from cac:AllowanceCharge inside cac:Price in each affected cac:InvoiceLine or cac:CreditNoteLine. If you need to keep the explanation, write it in the line note (BT-127). Do not add the same discount again at line level just to record its reason. 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 AllowanceChargeReason

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-634 still fails, and which other rules do.

Updated 6 November 2026