# UBL-SR-55

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 Invoice shall contain maximum one Payment Mandate (BG-19).

Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-55/

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 invoice shall contain at most one payment mandate. The statement ends with a period and says shall. It is 61 characters. The flag is fatal. The context is an invoice or a credit note. The published test does not wrap the count in parentheses. It counts the payment mandate. The count comparison has a space before <= and a space after it.

## What to change

Send at most one payment mandate.

## Illustration

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

**Fails the stated condition.** An invoice has two payment mandates.

**Passes the stated condition.** An invoice has one payment mandate, or none.

## Published context and test

Copied from the source. Not reimplemented on this page.

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

```
count(cac:PaymentMeans/cac:PaymentMandate) <= 1
```

[All rule notes](https://einvoicegoblin.com/rules/index.md) · [JSON](https://einvoicegoblin.com/rules/UBL-SR-55.json) · [HTML](https://einvoicegoblin.com/rules/UBL-SR-55/) · [llms.txt](https://einvoicegoblin.com/llms.txt) · [Invoice page](https://einvoicegoblin.com/) · [Privacy](https://einvoicegoblin.com/privacy.html)