# BR-CO-19

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

> If Invoicing period (BG-14) is used, the Invoicing period start date (BT-73) or the Invoicing period end date (BT-74) shall be filled, or both.

Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/BR-CO-19/

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

If an invoicing period (BG-14) is used, the invoicing period start date (BT-73) or the invoicing period end date (BT-74) must be filled, or both. The statement ends with a period. The context is the invoice period. The published test passes when either date exists, and also when a description code exists and both dates are absent. That third branch calls exists. The test does not compare the two dates.

## What to change

When an invoicing period is present, send the start date (BT-73), the end date (BT-74), or both.

## Illustration

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

**Fails the stated condition.** An invoicing period has neither a start date, nor an end date, nor a description code.

**Passes the stated condition.** An invoicing period has a start date and no end date.

## Published context and test

Copied from the source. Not reimplemented on this page.

```
cac:InvoicePeriod
```

```
exists(cbc:StartDate) or exists(cbc:EndDate) or (exists(cbc:DescriptionCode) and not(exists(cbc:StartDate)) and not(exists(cbc:EndDate)))
```

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