What it means
The seller trading name (BT-28) is the name you trade under when it differs from your legal name. In UBL it is cbc:Name inside the seller's cac:PartyName. The rule allows at most one. The field itself is optional.
Why it matters
The standard has one place for it.
How to fix it
In your invoicing software, look at the company name, trading name or brand fields in the seller details and keep the one name customers know you by. If the software fills the trading name from more than one place, clear all but one. The trading name is optional, so you can also leave it empty. In the XML, keep one cac:PartyName with one cbc:Name under cac:AccountingSupplierParty/cac:Party.
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
Seller trader name shall occur maximum once 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-SR-10 still fails, and which other rules do.
Related rules
- UBL-SR-11 An invoice can have only one seller company registration number
- UBL-SR-12 An invoice can have only one seller VAT number
- UBL-SR-13 An invoice can have only one seller tax number
- UBL-SR-14 Seller additional legal information can be given only once
- UBL-SR-15 An invoice can have only one buyer name
- UBL-SR-16 An invoice can have only one buyer identifier