# BR-10 Buyer postal address is required

An invoice shall contain the Buyer postal address (BG-8), the group describing where the customer is located.

## Problem Description

An invoice shall contain the Buyer postal address (BG-8), the group describing where the customer is located.

> **ERROR**: XRechnung 3.0

## Context and Significance

This is a core EN16931 rule; the buyer location is required for tax place-of-supply logic, so the buyer address group must be present.

## Solution

Add cac:AccountingCustomerParty/cac:Party/cac:PostalAddress with at least the country code and the applicable address components.

- validate
- convert

## Valid Examples

- BG-8 present with cac:PostalAddress containing city, postal code and country

## Invalid Examples

- The customer party has no cac:PostalAddress element at all

## Code Examples

### Valid XML
```
<cac:Party>
  <cac:PostalAddress>
    <cbc:CityName>Muenchen</cbc:CityName>
    <cbc:PostalZone>80331</cbc:PostalZone>
    <cac:Country>
      <cbc:IdentificationCode>DE</cbc:IdentificationCode>
    </cac:Country>
  </cac:PostalAddress>
</cac:Party>
```

### Invalid XML
```
<cac:Party>
  <cac:PartyLegalEntity>
    <cbc:RegistrationName>Beispiel Einkauf AG</cbc:RegistrationName>
  </cac:PartyLegalEntity>
</cac:Party>
```

## Affected Fields

- [BG-8 Buyer postal address](/resources/xrechnung)

## Related Rules

- [BR-07](/resources/kosit-validator-errors/br-07-buyer-name-required)
- [BR-11](/resources/kosit-validator-errors/br-11-buyer-country-code-required)

## 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.