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Warning

UBL-CR-557: A line discount or charge should not have a per-unit amount

In short

Warning: worth checking.

UBL-CR-557 means a discount or charge on an invoice line states an amount per unit (cbc:PerUnitAmount), which EN 16931 does not use. Remove it and give the total amount of the discount or charge instead.

On this page

What it means

The rule checks every discount or charge on a line (cac:AllowanceCharge) for a per unit amount, the discount or charge for each unit, to be multiplied by the quantity. The test only checks that the element is present.

Why it matters

This is a warning.

How to fix it

Delete cbc:PerUnitAmount from the discount or charge. Make sure the amount of the discount or charge is the total, which is the per unit amount multiplied by the quantity of the line. Then check that the line amount adds up with 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 AllowanceCharge PerUnitAmount

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-557 still fails, and which other rules do.

Updated 6 November 2026