# UBL-SR-45

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

> Due Date shall occur maximum once

Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-45/

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 due date shall occur at most once. The statement has no period and says shall. It is 33 characters. The flag is fatal. The context is the same string as BR-CO-18. The published test counts the payment due date. The count comparison has a space before <= and no space after it.

## What to change

Send at most one payment due date.

## Illustration

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

**Fails the stated condition.** The invoice has two payment due dates.

**Passes the stated condition.** The invoice has one payment due date, or none.

## Published context and test

Copied from the source. Not reimplemented on this page.

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

```
(count(cac:PaymentMeans/cbc:PaymentDueDate) <=1)
```

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