What it means
This rule checks that no cac:AdditionalDocumentReference in a UBL invoice or credit note contains cbc:CopyIndicator, a yes or no flag saying the document is a copy. It applies to all additional document references, including supporting documents (BG-24), which use a document reference (BT-122) and may have a description (BT-123).
Why it matters
EN 16931 recommends leaving the copy indicator out of additional document references.
How to fix it
Delete cbc:CopyIndicator from cac:AdditionalDocumentReference, or ask your invoicing software supplier to stop exporting it there. If the reference is for a supporting document and you need to identify it as a copy, say so in its description (BT-123). Recheck the corrected 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 AdditionalDocumentReference CopyIndicator 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-110 still fails, and which other rules do.
Related rules
- UBL-CR-111 Leave the UUID out of additional document references
- UBL-CR-112 Leave the issue date out of additional document references
- UBL-CR-113 Leave the issue time out of additional document references
- UBL-CR-114 Leave the document type text out of additional document references
- UBL-CR-115 Leave the XPath out of additional document references
- UBL-CR-116 Leave the language out of additional document references