How to capture page overflow in rtf template - BI Publisher

Summary

I need to display the sum of a particular field for all the Invoices in the current page only even if the Invoices overflow to the next page

Content

Hello,

I have an rtf template where I have a repeating group for invoices and Group By on 1) Vendor name and 2)Account. After each account group, I have to display the sum for the debit, credit and balance.(Successful)

My issue: If the invoices(rows) in an accounting group overflow to the next page(pdf), I have to display the sum(debit, credit and balance) for the invoices on the current page only for that particular accounting group. (Unsuccessful)