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Warning

UBL-CR-636: A prepaid flag does not belong inside the line price

In short

Warning: worth checking.

UBL-CR-636 means a cac:AllowanceCharge block inside an invoice or credit note line's price contains a prepaid flag (cbc:PrepaidIndicator). Remove the element even if its value is false. An amount already paid belongs in the document-level paid amount (BT-113), where applicable.

On this page

What it means

The rule checks every cac:Price/cac:AllowanceCharge on invoice and credit note lines for cbc:PrepaidIndicator. It checks whether the element exists, not whether the flag is true or false. It does not check the document-level paid amount (BT-113).

Why it matters

A prepaid flag inside a price discount is not the field EN 16931 uses to record an amount already paid.

How to fix it

Remove cbc:PrepaidIndicator from cac:AllowanceCharge inside cac:Price in each affected cac:InvoiceLine or cac:CreditNoteLine; setting it to false does not resolve this warning. If you need to record an amount already paid, check the document-level paid amount (BT-113). 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 PrepaidIndicator

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-636 still fails, and which other rules do.

Updated 6 November 2026