Changing the text of DISCRGVAL column on the lines tab of the invoice screen

SOLVED

Does anyone know how to do the above? I've been asked to update the column names on the invoice screen to reflect what our users actually call it but can't seem to find a way to do that. I've tried updating the title, abbreviated title and the long title columns in the table dictionary but it doesn't filter through to the screen. I've also looked everywhere I can think of to see where a column description would be without success. Any help would be appreciated.

Thanks,

Paul