errorEN 16931

`PEPPOL-EN16931-R120`:Line amount does not match calculation

The net amount on one of your invoice lines does not match when we recalculate it from the quantity, price, and any line-level discounts or surcharges. This usually means a rounding error or data entry mistake in your accounting system.

Severity

Fatal

Rule set

EN 16931

Country

All EU

Fix type

BLOCKED

Confidence

95%

Engine Classification

Financial or legal field · Modification blocked by policy

Reason: Line amounts are financial data controlled by your accounting system. Automatically changing these values would create a discrepancy between your invoice and your books, which is an audit risk. Please correct this in your accounting software and re-export.

What is PEPPOL-EN16931-R120?

PEPPOL-EN16931-R120 is a fatal validation rule defined in the EN 16931 specification. It validates the LineExtensionAmount element under Invoice > InvoiceLine 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: XPath: /Invoice/cac:InvoiceLine/cbc:LineExtensionAmount

This error requires manual correction — financial fields are protected by policy.Get API Access

Why This Error Matters

Invoice will be rejected by PEPPOL validation. Line calculations must be mathematically consistent.

PEPPOL-EN16931-R120 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.

Validator Behavior

·Causes invoice rejection
·Error returned: PEPPOL-EN16931-R120
·Specification: EN 16931

How to Fix It

Before / After

Failing XML

<Invoice>
  <!-- Issue: Invoice line net amount MUST equal (Invoiced quantity × Item -->
</Invoice>

Corrected XML

<Invoice>
  <!-- Issue resolved per EN 16931 -->
</Invoice>

Technical Reference

XPathXPath: /Invoice/cac:InvoiceLine/cbc:LineExtensionAmount

SpecEN 16931

StrategyCannot auto-fix: line amounts are financial data that must be corrected in the source accounting system

Common Causes

·Line net amount does not match calculation formula
·Rounding differences in multiplication
·Base quantity not accounted for in calculation
·Allowances or charges changed without updating net
·Manual override of line net amount

Seeing this in production? The API handles PEPPOL-EN16931-R120 automatically. See the fix response →

ERP-Specific Causes

Frequently Asked Questions

Line amount must equal quantity × price ± allowances/charges.

Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per EN 16931 (PEPPOL-EN16931-R120). This error involves a protected field — Invoice Navigator flags it in your pipeline so your team can correct it at the source.

Yes, PEPPOL-EN16931-R120 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.

PEPPOL-EN16931-R120 involves a financial or legal field that cannot be auto-modified by policy. Invoice Navigator detects and flags this error immediately, but the correction must be made manually in your ERP or invoicing software.

Detect PEPPOL-EN16931-R120 Before Submission

This error involves a financial or legal field that cannot be auto-modified. The compliance engine flags it immediately with a clear diagnosis so your team can fix it at the source.

Get API Access View API Documentation

PEPPOL-EN16931-R120:Line amount does not match calculation