how to set flag in badi HRPAD00INFTY

hi,

i am unable to set flag in badi HRPAD00INFTY. when ever my z screen call by this method flag value is zero. anyone know how to set the flag .

method IF_EX_HRPAD00INFTY~IN_UPDATE .

if flag is initial.

Call transaction 'ZHR_EMPDTL1'.

flag = 'X'.

endif.

endmethod.