The seller contact telephone number is missing
The `Seller contact telephone number` element (BT-42) must be provided.
Only the issuer holds this value: Factlint reports it and never fabricates it. Test your invoice to find out whether it is affected.
The message your validator prints
Copied verbatim from the sealed artefact: this is the exact sentence the check prints when this rule fails.
[BR-DE-6] Das Element "Seller contact telephone number" (BT-42) muss übermittelt werden.
Quoted from schematron-xrechnung 3.0.2, licensed under Apache-2.0.
Common searches around this code
These phrases mirror what an integrator searches for: code, syntax, rule, business field and correction.
Test your file with this error in mind
Upload the invoice involved: the report will say whether this code appears, where it appears in the document, and whether Factlint can only report it or also fix it.
To automate this check in an ERP flow, call the validation API and link every returned code to its public page.
Why this error happens
German public bodies want to reach the issuer without going back through the document. Presence is blocking; the shape of the number is not — BR-DE-27 checks that, as a warning.
How to fix it
Fill in a reachable number in the seller record. Factlint reports it as `needs_input` and never fabricates a default value.
XML correction example
<!-- ram:DefinedTradeContact/ram:TelephoneUniversalCommunication absent -->
<ram:CompleteNumber>+49 30 1234567</ram:CompleteNumber>