# BR-DE-3 Seller city must be provided

The seller's city must be provided on the invoice.

## Problem Description

The seller's city must be provided on the invoice.

> **ERROR**: XRechnung 3.0

## Context and Significance

A complete postal address is required for reliable identification of the seller and for auditability. The city is a mandatory part of the seller postal address in German invoice validation profiles.

## Solution

Add the seller's city to the invoice.

## Valid Examples

- Berlin
- München
- Hamburg

## Invalid Examples

- City missing
- Empty <cbc:CityName/>

## Code Examples

### Valid XML
```
<cac:AccountingSupplierParty>
  <cac:Party>
    <cac:PostalAddress>
      <cbc:CityName>Berlin</cbc:CityName>
    </cac:PostalAddress>
  </cac:Party>
</cac:AccountingSupplierParty>
```

### Invalid XML
```
<cac:AccountingSupplierParty>
  <cac:Party>
    <cac:PostalAddress>
      <!-- Missing cbc:CityName -->
    </cac:PostalAddress>
  </cac:Party>
</cac:AccountingSupplierParty>
```

## Technical Details

### Affected Fields
Seller Postal Address, Seller City

## Related Rules

- [BR-DE-4](/resources/kosit-validator-errors/br-de-4-seller-postal-code-must-be-provided)
- [BR-DE-5](/resources/kosit-validator-errors/br-de-5-seller-country-must-be-provided)

## 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.