What it means
The check looks for cbc:ExtendedID inside cac:Item/cac:BuyersItemIdentification on every cac:InvoiceLine or cac:CreditNoteLine. The element should be absent, even if cbc:ID is missing or cbc:ExtendedID is empty. The buyer's item number (BT-156) goes in cbc:ID inside cac:BuyersItemIdentification.
Why it matters
The EN 16931 UBL rules do not use an extended identifier inside the buyer's item identification.
How to fix it
Remove cbc:ExtendedID from cac:Item/cac:BuyersItemIdentification on every invoice or credit note line. Keep the buyer's item number (BT-156) in cbc:ID, using the identifier supplied by the buyer. If you need the extra information, put it in the item description instead. Recheck the file.
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 BuyersItemIdentification ExtendedID 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 |
Check your file
Drop your e-invoice to see whether UBL-CR-571 still fails, and which other rules do.
Related rules
- UBL-CR-572 The buyer's item number should not have a barcode type
- UBL-CR-573 The buyer's item number should not carry physical attributes
- UBL-CR-574 The buyer's item number should not carry dimensions
- UBL-CR-575 The buyer's item number should not name an issuer
- UBL-CR-576 The seller's item number should not have an extended ID
- UBL-CR-577 The seller's item number should not have a barcode type