How do I fix UBL-CR-640?

Invoice Navigator automatically removes the disallowed `cbc:PerUnitAmount` element from your Invoice (UBL-CR-640). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.

Is UBL-CR-640 a critical error?

Yes, UBL-CR-640 is a critical error that will cause invoice rejection. It must be fixed before submission.

Can UBL-CR-640 be automatically fixed?

Many instances of UBL-CR-640 can be automatically corrected using Invoice Navigator's compliance engine. The fix is applied in your pipeline with full audit evidence.

errorUBL 2.1

`UBL-CR-640`:A UBL invoice should not include the InvoiceLine Item Price AllowanceCharge...

UBL 2.1 Invoice schema does not include `cac:Price/cac:AllowanceCharge/cbc:PerUnitAmount`. This element must be removed for EN 16931 compliance.

Severity

Fatal

Rule set

UBL 2.1

Country

All EU

Fix type

AUTO-FIX

Confidence

95%

Engine Classification

Remove disallowed UBL element per EN16931 specification

Confidence: 95% · Applied automatically in pipeline

What is UBL-CR-640?

UBL-CR-640 is a fatal validation rule defined in the UBL 2.1 specification. It validates the PerUnitAmount element under Price > AllowanceCharge 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: /Invoice/cac:InvoiceLine/cac:Price/cac:AllowanceCharge/cbc:PerUnitAmount

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Why This Error Matters

Invoice will be rejected by EN16931 validators. These conformance rules prohibit UBL elements that are not part of the EN16931 e-invoicing profile. Remove the disallowed element.

UBL-CR-640 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
·Fails UBL schema validation
·Error returned: UBL-CR-640
·Specification: UBL 2.1

Before / After

Failing XML

<cac:AllowanceCharge>
  <cbc:PerUnitAmount>value</cbc:PerUnitAmount>
</cac:AllowanceCharge>

Corrected XML

<cac:AllowanceCharge>
  <!-- cbc:PerUnitAmount removed for EN 16931 compliance -->
</cac:AllowanceCharge>

Technical Reference

XPath/Invoice/cac:InvoiceLine/cac:Price/cac:AllowanceCharge/cbc:PerUnitAmount

SpecUBL 2.1

Operationremove

StrategyRemove disallowed UBL element per EN16931 specification

Common Causes

·Invoice line price allowance contains per unit amount
·Price AllowanceCharge PerUnitAmount not permitted
·Per-item discount amount not in EN16931 price
·Unit-based allowance not needed in price
·ERP exports per-unit discounts in price structure

Seeing this in production? The API handles UBL-CR-640 automatically. See the fix response →

Handle UBL-CR-640 Automatically in Your Pipeline

The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.

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UBL-CR-640:A UBL invoice should not include the InvoiceLine Item Price AllowanceCharge...