create f4 function on standard program
i have a requirment where in SAP standard program SAPLCBIH_IA00 where i have a table control. on clicking on the TAB - Train Service Impact i get three FIELDS where i have to add F4 Functionality to the one of the three fields ex : STAGE LOAD is a field where i have to add F4 functionality a pop up box should appear.
i have created the pop up box and have done the logic and and my concern is...
how can i link that box to that characteristic feild as F4 functionality... pls adivce me