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BR-DE-6BT-42
input
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.
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.