Hi,
First i need clarity about the question.
if you want do any changes there consult webdynpro abap consultants.its a POWL class we need to enhance standard POWL based on our recruitment
class name put the debugging :CL_HRHAP00_STARTPG_POWL check whether its trigerring or not if it is triggring enhance this class go to get_field_catalog method write the code in post exit.
Regards
Jayaprakash