AP Quick Payment - Bank Charge deduction Issue

Dear Expert

I have one issue about AP bank charge deduction .

My Setup steps and test script as below.

1.    Setup bank charge calculation
(N) AP à Setup à Payments à Bank Charge Calculations
Transferring Bank / Branch = All Bank / All Branch
Receiving Bank / Branch = All Bank / All Branch
Transfer Priority = Normal
Currency = TWD
Transfer Amount From / To = 0 / Null ( Not define )
Bank Charge : Standard / Negotiate =  $10 / $5
Effective Date From / To = 1-Jan-2011 / Null ( Not Define)

 

2.    Setup Payables Option – Accounting Option
(N) AP à Setup à Options à Payables à [Tag] Accounting Option à Payment Accounting
- enable     [ v ] When Payment is Issued  
- not enable  [  ] When Payment is Clears

3.    Setup Payables Option – Payment
(N) AP