Connection between IBAN and BIC
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Netherlands is one of the few countries using BIC bank code as part of the IBAN code, instead of a separate national bank code. This allows us to check that IBAN is indeed associated with the bank BIC states it is.
Structure of IBAN and BIC:
IBAN: CCkk BBBB AAAA AAAA AA
BIC: BBBB CC LL
k = check digit
B = bank code
A = account number
L = location code
C = country code
Bank codes of IBAN and BIC have to match.
For example, in the following IBAN and BIC do not match:
<DbtrAcct> <Id> <IBAN>NL12INGBxxxxxxxxxx</IBAN> </Id> </DbtrAcct> <DbtrAgt> <FinInstnId> <BIC>RABONL2U</BIC> </FinInstnId> </DbtrAgt>