Sum Value for each Vendor

Hi Developers/Coders,

I have modify my report ( Vendor Account Statement ), I added summary value for field amount in transaction currency.

the problem is, I generate report by vendor group, right now the summarized value is calculated for all vendor and stated same for each page ( I use new page to split each vendor account statement )

how to only summarize the value for each vendor, so the summarized value will be recalculate for each vendor.

for example, vendor A = 500 + 200, vendor B = 300 + 150.

the summarized value at page 1 for vendor A = 700, Vendor B = 450.

right now the summarized value for all page ( all vendor is ) 1.150

Thank you, need your explanation to Recalculate ( in Crystal report, there are option to re-evaluate for each change of group/vendor )