Change Bank Account Number

We are using Oracle E-Business R 12.1.3.  The bank account number defined in the system is not the same as the real bank account.  We need to change this so that BAI2 file may be uploaded.  I am trying to decide what would be better, creating a new bank account or updating the bank account number.  If I create a new bank account, I have issues with outstanding transactions in Cash Management besides many changes I'd have to make in other places.  If I update the bank account number, the Treasury Bank Account Number Reference can't be updated and I