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BR-DE-31BT-91
input
The debited account identifier is missing
When the `DIRECT DEBIT` group (BG-19) is present, the `Debited account identifier` (BT-91) 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
The counterpart of BR-DE-30: one says who collects, the other from which account. When the account is present but wrong, BR-DE-20 reports it instead, as a warning.
How to fix it
Copy the account from the mandate your customer signed. Factlint does not write it: it is a payment detail (rule 1).