How to add Labour Class description to Transaction Detail Enquiry screen grid

Hi There,

I want to add the Labour Class Description( next to the labour class) into the grid on the TRansaction Detail Enquiry (project) screen (PATRD). I have added code in VBA in the chk field event of the labour class field (pjtran.tr_id05) but as this is an enquiry screen I cannot get this code to trigger and populate the description as the labour class is already there and not being entered by the user. I am using SL 2011. Can anybody help me?