Rules / DE-R-006 · Markdown

Peppol BIS Billing 3.0 · rule

DE-R-006

Layer peppol·Checked against Peppol BIS Billing 3.0 2026.5

What does DE-R-006 mean? If both supplier and customer are located in Germany, the element "Seller contact telephone number" (BT-42) shall be provided.

Why did my invoice fail DE-R-006?

For domestic German invoices (both supplier and customer located in Germany), the Seller contact telephone number (BT-42) is mandatory. This is a German XRechnung-derived tightening of Peppol BIS 3.0, where the field is normally optional, so the buyer always has a phone contact for queries about the invoice. In UBL the value is carried in cac:AccountingSupplierParty/cac:Party/cac:Contact/cbc:Telephone.

Official rule text

If both supplier and customer are located in Germany, the element "Seller contact telephone number" (BT-42) shall be provided.

Common causes

• The cac:Contact block or its cbc:Telephone child is missing entirely from the supplier party
• The invoicing software only fills contact details for cross-border invoices and skips them for domestic ones
• Both parties have DE country codes but the seller record in the ERP has no phone number on file

How do I fix it?

<cac:AccountingSupplierParty>
  <cac:Party>
    <cac:Contact>
      <cbc:Telephone>+49 30 1234567</cbc:Telephone>
    </cac:Contact>
  </cac:Party>
</cac:AccountingSupplierParty>

Related rules

DE-R-001 · DE-R-002 · DE-R-003 · DE-R-004 · DE-R-005 · DE-R-007 · DE-R-008 · DE-R-009