Invalid national checksum error for generated german BBANs

[tim-haselhoff]

Hello,

I found that when randomly generating German IBANs a lot of times an InvalidBBANChecksum Error gets thrown because of an invalid national checksum.

import schwifty


rand = schwifty.IBAN.random(country_code="DE")
print(rand.formatted)
result = rand.validate(validate_bban=True)
print(result)

This is a code snippet I have been using to generate and validate the IBAN values.

It works with IBANs when the county_code is set to GB and IT and I believe that it is due to it not finding the right checksum algorithm because validation with pre-made IBANs does work.

[mdomke]

Yes. It's a bit tricky for German BBANs because there are so many bank specific algorithms. I will try to find a solution for this.