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Warning

UBL-CR-639: An accounting reference does not belong inside the line price discount

In short

Warning: worth checking.

UBL-CR-639 means a cac:AllowanceCharge block inside an invoice or credit note line's price contains an accounting reference (cbc:AccountingCost). Remove it from that block. Move it to the line's buyer accounting reference (BT-133) only if that is what the reference identifies.

On this page

What it means

The rule checks every cac:Price/cac:AllowanceCharge on invoice and credit note lines for cbc:AccountingCost. UBL-CR-638 checks the coded form, cbc:AccountingCostCode. The buyer accounting reference directly on the line (BT-133) is outside this check.

Why it matters

EN 16931 has a buyer accounting reference for a line, but no separate accounting reference for a price discount.

How to fix it

Remove cbc:AccountingCost from cac:AllowanceCharge inside cac:Price in each affected cac:InvoiceLine or cac:CreditNoteLine. If the buyer supplied the reference for the whole line, enter it as the buyer accounting reference (BT-133). Do not move an internal or discount-only reference there automatically. 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 AccountingCost

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-639 still fails, and which other rules do.

Updated 6 November 2026