SRM PO CHANGE SMARTFORM

Hi friends,

I’m developing a SRM Purchase Order CHANGE smartform. The form should only print those line items that got changed (quantity or price or new line item added to PO). Can anyone tell me how to pass only changed datas to smartform. I’m assuming that I’ve copy the std. Form BBP_PO. I will award points to any useful answers

Thanks a lot.

-Nash