Azin

There is an Invoice to which client keeps paying via Installments, so main invoice is 7000 and client pays 500 each installment. I was adding each payment with correct date and due amount and all were fine. Last payment I by mistake entered the full balance due amount and recorded the payment, but the actual payment should only be 500. So i deleted the payment.. After I deleted I noticed that the complete payments done before have got removed from Invoice and it shows the full amount as Due. But in the Payments list am able to see all the previous payments and invoice number is also correct. How can those previous payment receipts get added to the invoice and show the due correctly in the invoice again now ?