`DE-R-006`

XRechnung (KoSIT) · validation rule

XRechnung (KoSIT)Error

Peppol national rule for German parties (same requirement as XRechnung BR-DE-6): XRechnung requires a seller contact telephone number (BT-42). The sender must fill cac:Contact/cbc:Telephone / ram:DefinedTradeContact/ram:TelephoneUniversalCommunication/ram:CompleteNumber.

Field: seller.contact.phone (BT-42)
Rule set: XRechnung (KoSIT)
Rule-set version: XRechnung 3.0.2 Schematron 2.6.0 · in force since 2026-10-17 · Rule-set changelog
Who has to fix it: The sender

This is a property of the file you received, so it cannot be corrected on your side without changing the document — ask the supplier to reissue it.

Check your own invoice

Drop the file that failed. We parse it, run the official rule sets against it and list every finding with a fix — 20 invoices per day, no key, nothing stored.

Open the live demo

Same explanation over the API: GET /v1/rules/DE-R-006?lang=en