updating table

The table zmm_dprpo contains refbn and rfpos which was declared and used in X program

i would like to get the price (netpr) of refbn(document no)

for a particular group 6000 (matkl) in Y program

since refbn and ebeln in ekpo are same, i have to get the netpr of refbn from ekpo

but i have to display this price in y program

Could anybody suggest how to do it