SOLUTION:

OPTION 1: To enter manually, Click on "Reallocate" and Provide the Payment Method and House Bank details

OPTION 2: To Pick automatically from Invoice, Go to FB02 > Enter Document Number and Provide Payment Method and House Bank details

OPTION 3: Go to Transaction Code BP > Select Role FLVN00 and under Vendor Payment Transactions > Provide Payment Methods and House Bank details and SAVE.

Thanks,

Adharsh K S