UBL-CR-391:A UBL invoice should not include the DeliveryParty IndustryClassificationCode
Fix: Invoice Navigator automatically removes the disallowed `cbc:IndustryClassificationCode` element from your Invoice (UBL-CR-391). Upload your invoice to fix this automatically.
Your invoice contains a DeliveryParty IndustryClassificationCode element which is not allowed in EN16931 invoices. This element must be removed.
Engine Classification
Remove disallowed UBL element per EN16931 specification
Confidence: 95% · Applied automatically in pipeline
What is UBL-CR-391?
UBL-CR-391 is a fatal validation rule defined in the UBL 2.1 specification. It validates the IndustryClassificationCode element under Delivery > DeliveryParty in the UBL invoice XML.
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Target path: /Invoice/cac:Delivery/cac:DeliveryParty/cbc:IndustryClassificationCode
Why This Error Matters
Invoice will be rejected by PEPPOL/EN16931 validators. Safe to remove - these elements are explicitly prohibited in EN16931 and contain no required business data.
UBL-CR-391 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.
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-391
- ·Specification: UBL 2.1
How to Fix It
Locate the disallowed element
Open your invoice XML and find cbc:IndustryClassificationCode at /Invoice/cac:Delivery/cac:DeliveryParty/cbc:IndustryClassificationCode. This element is not permitted in the target e-invoice profile and triggers UBL-CR-391.
Remove cbc:IndustryClassificationCode
Delete the entire cbc:IndustryClassificationCode block and its child elements. Invoice Navigator automatically removes the disallowed `cbc:IndustryClassificationCode` element from your Invoice (UBL-CR-391).
Re-validate your invoice
Upload the corrected invoice to confirm UBL-CR-391 is resolved. If your software consistently adds this element, contact your vendor about their e-invoice export settings.
Before / After
<cac:DeliveryParty> <cbc:IndustryClassificationCode>value</cbc:IndustryClassificationCode> </cac:DeliveryParty>
<cac:DeliveryParty> <!-- cbc:IndustryClassificationCode removed for EN 16931 compliance --> </cac:DeliveryParty>
Technical Reference
/Invoice/cac:Delivery/cac:DeliveryParty/cbc:IndustryClassificationCodeCommon Causes
- ·Source ERP exports full UBL 2.1 delivery fields instead of EN16931 subset
- ·Generic UBL template includes optional delivery location elements not needed for e-invoicing
- ·Conversion from another format added unsupported delivery elements
- ·Manual XML editing introduced non-standard elements
- ·Invoice software not configured for EN16931 compliance
Seeing this in production? The API handles UBL-CR-391 automatically. See the fix response →
Frequently Asked Questions
Your invoice contains a DeliveryParty IndustryClassificationCode element which is not allowed in EN16931 invoices. This element must be removed.
Invoice Navigator automatically removes the disallowed `cbc:IndustryClassificationCode` element from your Invoice (UBL-CR-391). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
Yes, UBL-CR-391 is a critical error that will cause invoice rejection. It must be fixed before submission.
Many instances of UBL-CR-391 can be automatically corrected using Invoice Navigator's compliance engine. The fix is applied in your pipeline with full audit evidence.
Last updated: 14 April 2026
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