Hi Raavi Singh
Your issue is, bank will be select at the time of APP run. As you know in APP Ranking Order used for bank selection.
Some more clarification may help you.
In Bank selection two folder is important. One is RANKING ORDER and Second one is ACCOUNTs and AMOUNTs.
In Ranking Order all banks are mentioned on basis of which bank should be used for payment first, second, third etc.
In Account & Amount folder must mention available amount for the bank account.
When APP run, APP select bank by the following steps.
STEP -1 Ranking order, which bank should be used first, second etc
STEP -2 What is the available amount for the bank account.
STEP -3 What payment method to be used, based on payment method in APP proposal, party master, APP configuration etc.
STEP-4 Type of currency
Regards
Nakul