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E-invoice error explained

BR-DE-6: Seller contact phone number is missing

The seller contact block has no phone number.

What the rule checks

The seller contact block has no phone number. XRechnung requires one so the buyer can call with questions. In addition, BR-DE-27 warns when the number has fewer than three digits.

Official rule text

The element "Seller contact telephone number" (BT-42) must be transmitted.

Source: KoSIT configuration XRechnung 3.0.2 (31 Jan 2026).

Typical causes

  • No phone number is maintained in the company data.
  • The number is only in the PDF letterhead, not in the master data the export reads.
  • The export writes the number to a fax field or to the wrong party.

How to fix it

Add ram:TelephoneUniversalCommunication/ram:CompleteNumber to the contact block, preferably in international format, for example "+49 931 123456".

Example

Wrong (CII)

<ram:DefinedTradeContact>
  <ram:PersonName>Anna Beispiel</ram:PersonName>
  <ram:EmailURIUniversalCommunication>
    <ram:URIID>rechnung@muster.de</ram:URIID>
  </ram:EmailURIUniversalCommunication>
</ram:DefinedTradeContact>

Right (CII)

<ram:DefinedTradeContact>
  <ram:PersonName>Anna Beispiel</ram:PersonName>
  <ram:TelephoneUniversalCommunication>
    <ram:CompleteNumber>+49 931 123456</ram:CompleteNumber>
  </ram:TelephoneUniversalCommunication>
  <ram:EmailURIUniversalCommunication>
    <ram:URIID>rechnung@muster.de</ram:URIID>
  </ram:EmailURIUniversalCommunication>
</ram:DefinedTradeContact>

In Dynamics 365, Business Central and Finance

Sales / Project Operations: Sales and Project Operations have no e-invoice output out of the box. In the WBS Invoice Accelerator for Dynamics 365 the name, phone and e-mail come from the brand profile: Contact person, Phone and Email. Contact person is not on the brand profile form in version 1.1.0.2. Your administrator can ask WBS to set it.

Business Central: Fill Contact Person, Phone No. and E-Mail on the Company Information page. If the file still has no contact, also check the salesperson (Salesperson Code) on the sales document, because depending on the export format the contact can come from there.

Finance: Finance takes the legal entity's contact details from the Person linked to the signed-in user. Check the name, phone and e-mail of that person.

Related error codes

All error codes

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