# UBL-SR-10

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 trader name shall occur maximum once

Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-10/

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 trader name shall occur at most once. The statement has no period and says shall. The flag is fatal. The context is the same string as BR-CO-18. The published test counts the seller party name. The comparison has a space before <= and a space after it.

## What to change

Send at most one seller party 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 party names.

**Passes the stated condition.** The seller party has one party 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:PartyName/cbc:Name) <= 1)
```

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