Accepting invalid German IBANs
Using the kontocheck package sometimes results in rejecting seemingly valid German IBANs. The reason is that some banks don't follow their own IBAN generation rules (eg. Deutsche Bank and Commerzbank).
Upon request we got the following information:
- Deutsche Bank: The invalid IBANs can be used but transactions will be processed manually (Feb. 2018).
- Commerzbank: The invalid IBANs must be used, otherwise transactions will be rejected (Feb. 2017).
To accept such IBANs you have to patch the kontocheck package with the following code:
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44 | import kontocheck
def normalize_iban(iban):
"""
Try to correct a possibly incorrect IBAN.
"""
iban = iban.upper()
if not iban.startswith('DE'):
return iban
try:
kontocheck._check_iban(iban, True)
except kontocheck.KontoCheckError as err:
#IBAN_CHKSUM_OK_UNTERKTO_MISSING = -129
#IBAN_CHKSUM_OK_RULE_IGNORED = -130
if err.code in (-129, -130):
bankcode = iban[4:12]
account = iban[12:]
try:
iban_new = kontocheck.create_iban(bankcode, account)
except kontocheck.KontoCheckError:
return iban
bankcode_new = iban_new[4:12]
account_new = iban_new[12:]
# Only accept wrong zero padded account numbers
# Known banks: Deutsche Bank, Commerzbank
account = account.strip('0')
account_new = account_new.strip('0')
if bankcode == bankcode_new and account == account_new:
return iban_new
return iban
def _check_iban(iban, error=False):
iban = normalize_iban(iban)
return kontocheck._check_iban(iban, error)
kontocheck._check_iban = kontocheck.check_iban
kontocheck.check_iban = _check_iban
def _get_bic(iban):
iban = normalize_iban(iban)
return kontocheck._get_bic(iban)
kontocheck._get_bic = kontocheck.get_bic
kontocheck.get_bic = _get_bic
|
