Back to the error catalogue
BR-DE-20BT-91
input
The debited account identifier is not a valid IBAN for a SEPA direct debit
When `Payment means type code` (BT-81) is 59 (SEPA direct debit), `Debited account identifier` (BT-91) must be a correct IBAN.
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 mirror of BR-DE-19, on the debited account. Mistakes are more frequent here: the credit IBAN belongs to the seller and is captured once; the debit IBAN belongs to the customer and is copied from a mandate.
How to fix it
Fix the IBAN on the direct debit mandate. Factlint never writes it: it is a financial field (rule 1).
Severity returned by the rule set
The XRechnung package classifies this rule as `warning`. An in-scope warning still rules out a “compliant” verdict — at best the invoice comes out as `needs_input`.