# UBL-SR-09

Quoted from a public specification. This page is not a validator, and it is not tax, legal, or accounting advice.

- Country: EU
- Syntax: UBL
- Severity: fatal
- Statement language: en
- Last verified: 2026-10-18

## Official statement

> Seller name shall occur maximum once

Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-09/

Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL

Severity note: fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-18.

## Plain-language reading

The seller name shall occur at most once. The statement has no period, says shall, and is shorter than 40 characters. The flag is fatal. The context is the same string as BR-CO-18. The published test counts the seller legal entity registration name. The comparison has a space before <= and a space after it.

## What to change

Send at most one seller legal entity registration name.

## Illustration

Illustration of the condition in the official statement. Not an example published by the source.

**Fails the stated condition.** The seller party has two legal entity registration names.

**Passes the stated condition.** The seller party has one legal entity registration name, or none.

## Published context and test

Copied from the source. Not reimplemented on this page.

```
/ubl:Invoice | /cn:CreditNote
```

```
(count(cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:RegistrationName) <= 1)
```

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