CL_HRXSS_AU_PS to handle their request. Then we have defined method
named IF_HRXSS_SER_RFW~PROCESS_ACTION in this class, and this method
later calls function module HRXSS_AU_PS_GET_PDF.
is it occurring for all the employees? if yes, then ESS roles? or data check for all the employees ie IT0849?
check their authorisaiton first, by assigning SAP_ALL and checking if it works then problem with authorisaiton and their security roles
do a simple trace for authorisaiton using ST01/