Call ESS FPM CATS Working time application from non FPM web dynpro application on click of button

Hi,

My requirement is to launch ESS Working time application HRESS_AC_CATS_1 from custom web dynpro application.

ESS CATS working time application is configured in LPD_CUST launchpad.

I tried using method  cl_hr_navigation_services=>navigate in my custom web dynpro but it did not work.

Regards,

Ibrahim