# PEPPOL-EN16931-R020 Seller electronic address must be provided

Peppol requires the seller electronic address (BT-34).

## Problem Description

Peppol requires the seller electronic address (BT-34).

> **ERROR**: XRechnung 3.0

## Context and Significance

Seller and buyer electronic addresses identify both Peppol participants in the routing envelope.

## Solution

Add BT-34 with the seller endpoint identifier and matching scheme.

- validate
- convert

## Valid Examples

- BT-34 present with schemeID

## Invalid Examples

- Seller endpoint missing
- Endpoint value without schemeID

## Technical Details

### Affected Fields
BT-34 Seller electronic address

## Related Rules

- [PEPPOL-EN16931-R010](/resources/kosit-validator-errors/peppol-en16931-r010-buyer-electronic-address-must-be-present)

## 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.