PEPPOL-EN16931-R042:Discount or surcharge is missing the percentage
When you provide a base amount for a discount or surcharge, you must also provide the percentage. The percentage shows what portion of the base amount the discount or surcharge represents.
Engine Classification
Calculates the percentage from the amount and base amount: percentage = amount / baseAmount × 100
Confidence: 90% · Applied automatically in pipeline
What is PEPPOL-EN16931-R042?
PEPPOL-EN16931-R042 is a fatal validation rule defined in the EN 16931 specification. It validates the MultiplierFactorNumeric element in the UBL invoice XML.
When this rule fires, the invoice is non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.
Target path: cac:AllowanceCharge/cbc:MultiplierFactorNumeric
Why This Error Matters
Invoice will be rejected by PEPPOL validation. Base amount without percentage cannot be properly validated.
PEPPOL-EN16931-R042 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.
Invoice Navigator can automatically correct this error in your pipeline. The fix is applied with full audit evidence, so your compliance trail remains intact.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: PEPPOL-EN16931-R042
- ·Specification: EN 16931
How to Fix It
Find the incomplete discount/surcharge
One of your allowances or charges has a base amount but no percentage.
Calculate the percentage
Percentage = amount ÷ base amount × 100. For example, if amount is 50 and base amount is 500, the percentage is 10.
Add the percentage
Add the MultiplierFactorNumeric element with the calculated percentage value.
Before / After
<Invoice> <!-- Issue: Allowance/charge percentage MUST be provided when allowance/ --> </Invoice>
<Invoice> <!-- Issue resolved per EN 16931 --> </Invoice>
Technical Reference
cac:AllowanceCharge/cbc:MultiplierFactorNumericCommon Causes
- ·ERP exports base amount and amount but omits the percentage field
- ·Flat discount entered without calculating percentage of base
- ·Template missing MultiplierFactorNumeric
Seeing this in production? The API handles PEPPOL-EN16931-R042 automatically. See the fix response →
Commonly Seen In
See Also
Related Errors
Last updated: 27 February 2026
Handle PEPPOL-EN16931-R042 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.