Hi Andie,
to debug this z-method ZSCL_CRM_ERMS_AH_CIM_CSS=>IF_CRM_ERMS_SERVICE~EXECUTE you have to code an endless loop and debug the process.
Add this code:
WHILE 1 EQ 1.
ENDWHILE.
To debug the process, start transaction SM50, mark the relevant line, go to menu
Administration->Programm->Debugging
Kind regards,
Fabian