i need help in subreport in crystal report

it have a table call arinvt where both raw material and main material stored.

if it is purchased order raw material is stored and if it is sales order main material is stored.

i want to display raw material of po and find the rawmaterial of main material through sub report and display all raw material in main report

when i try to do it , it can found the raw material but what happened is the raw material returned by subreport is displayed on next record instead of current record. i did not have grouping in my report