I am creating a screen for entering duty for the items in a purchase order(PO). On entering the PO number and pressing enter the items the material number are fetched from EKPO table into a table control. On entering the Material Assessment value for each item and pressing enter again the duty has to calculated. The problem is that whenever an enter is pressed the items are fetched again and the table control is refreshed.
Both these processings should be done 'On enter only'. Is there a simple solution to this issue?