# BR-CL-26 Delivery location scheme must come from ISO 6523 ICD

The deliver-to location identifier scheme identifier (BT-71-1) must belong to the ISO 6523 ICD code list.

## Problem Description

The deliver-to location identifier scheme identifier (BT-71-1) must belong to the ISO 6523 ICD code list.

> **ERROR**: XRechnung 3.0

## Context and Significance

This EN16931 core code-list rule makes the delivery location resolvable against a registered scheme such as GS1 GLN.

## Solution

Set the schemeID of BT-71 to a valid ISO 6523 ICD code such as 0088 (GLN); remove the attribute if the location has no ICD-registered identifier.

- validate
- convert

## Valid Examples

- BT-71-1 = 0088 — GLN of the delivery site
- schemeID present and part of ISO 6523 ICD

## Invalid Examples

- BT-71-1 = GLN — name instead of ICD code
- BT-71-1 = 9999 — not in ISO 6523 ICD

## Code Examples

### Valid XML
```
<cac:Delivery>
  <cac:DeliveryLocation>
    <cbc:ID schemeID="0088">4098765000004</cbc:ID>
  </cac:DeliveryLocation>
</cac:Delivery>
```

### Invalid XML
```
<cac:Delivery>
  <cac:DeliveryLocation>
    <cbc:ID schemeID="GLN">4098765000004</cbc:ID>
  </cac:DeliveryLocation>
</cac:Delivery>
```

## Affected Fields

- [BT-71-1 Deliver-to location identifier scheme identifier](/resources/xrechnung/bt-71-deliver-to-location-identifier)

## Related Rules

- [BR-CL-10](/resources/kosit-validator-errors/br-cl-10-iso-6523-any-identifier-scheme)
- [BR-CL-11](/resources/kosit-validator-errors/br-cl-11-iso-6523-registration-scheme)

## 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.