# UBL-SR-51

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

> An address can only have one third line.

Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-51/

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

An address can have only one third line. The statement ends with a period and does not say shall. It is 40 characters. The flag is fatal. The context starts with // and names a postal address or an address. The published test allows no address line or exactly one. It writes = 1 and does not use <=.

## What to change

Send at most one address line on an address.

## Illustration

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

**Fails the stated condition.** An address has two address lines.

**Passes the stated condition.** An address has one address line, or none.

## Published context and test

Copied from the source. Not reimplemented on this page.

```
//cac:PostalAddress | //cac:Address
```

```
not(cac:AddressLine) or count(cac:AddressLine) = 1
```

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