Hello Krishna,
You just have to assign make the customization.
Assign Flow Types(1901) to Transaction Type in your example, assign it to product type 51A.
Every time you should assign flow type 1901 in other flow tab and amount manually. when ever the premature settlement arise.
I'm not sure whether we have any functionality to automatic update the bank charges in case of premature settlement. I would suggest you to use this function manually to have better control.
However, You can look for an option for derived flow, Please note you will not have control as we have in manually.
All the best.
Regards,
Jain