# BR-CL-06 VAT point date code must come from UNTDID 2005

The value added tax point date code (BT-8) must be one of the UNTDID 2005 restriction values 3, 35 or 432.

## Problem Description

The value added tax point date code (BT-8) must be one of the UNTDID 2005 restriction values 3, 35 or 432.

> **ERROR**: XRechnung 3.0

## Context and Significance

This EN16931 core code-list rule restricts a broad UN date-qualifier list to the three values relevant for VAT.

## Solution

Set BT-8 to 3 (invoice date), 35 (actual delivery date) or 432 (payment date); no other code is accepted.

- validate
- convert

## Valid Examples

- BT-8 = 35 — actual delivery date
- BT-8 = 432 — payment date

## Invalid Examples

- BT-8 = 5 — outside the allowed restriction
- BT-8 = 29 — valid in UNTDID 2005 but not permitted here

## Code Examples

### Valid XML
```
<cac:InvoicePeriod>
  <cbc:DescriptionCode>35</cbc:DescriptionCode>
</cac:InvoicePeriod>
```

### Invalid XML
```
<cac:InvoicePeriod>
  <cbc:DescriptionCode>5</cbc:DescriptionCode>
</cac:InvoicePeriod>
```

## Affected Fields

- [BT-8 Value added tax point date code](/resources/xrechnung/bt-8-vat-point-date-code)

## Related Rules

- [BR-CL-01](/resources/kosit-validator-errors/br-cl-01-untdid-1001-document-type)

## Validation Tools

- [Official KoSIT Validator](https://erechnungsvalidator.service-bw.de/): Validate your XRechnung files against all BR-DE rules.
- [Convert PDF to XRechnung](/pdf-to-xrechnung): Automatic validation error fixes when converting.

## Related Resources

- [Official Specification](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)
- [Complete Error List](/resources/kosit-validator-errors): Overview of all German XRechnung validation rules.