Payment Received through Bank transfer

Payment Received through Bank transfer

Dear Zoho team,
Hi I'm a new user from Hong Kong and have issue with updating the 'Payment Received' section. 
To explain the issue let assume there is an invoice issued to a customer for USD600.  When payment for an invoice through bank transfer the amount received in the bank is USD 580. The balance USD 20 is charged by my bank.
When updating this on 'Payment Received'.  The concerned invoice is still showing unpaid with USD 20 due.
Please guide me on the correct way to update the 'Payment received' tab.

Thanks & Best regards,
Siddhartha