Gopal,
BA12 US File import works perfectly for me. Please check the following below
1. That the transaction code on the bank statement txt file for import is the same as the code you added to the system on configuration as they differ by bank.
2. That when you are adding the code that BA12 is highlighted on top.
3. Confirm that the description is outgoing external payments on configuration.
4. Confirm that the debit/credit is set as decrease on configuration.
5. Confirm that the payment method is outgoing external payments.
6. Confirm that the downloaded bank statement txt file has not been altered.
See screenshot sample below
It's advisable to reconfirm the codes from your bank to be sure.
Regards,
Emeka