Scripting help with getting data to show in field after it has been calculated

[Jack Smith]

I have written a script that I execute with FM_butler when validation runs on the previous field. This script takes an alphanumeric abbreviation and looks up a counter that goes with that abbreviation to create a unique indentifier. The script works but for me to see the value I have to click on the screen in browse mode or got to create a new record and then go to previous to see the value in the field. Example of tables: Main, Product A, Product B, Product C.

Main table has a drop down box where you select product a,b,c and the tables for each product contain a number field. Result field in main table looks like A1 or B1 or C1 - as I said script works - but I wanted field to show value as I continue on to do more in that screen. I have tried to refresh screen - and not sure what I am missing.