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try double square braces

if [[ -f ${Pidfl3} ]]
then
if [[ -f ${Pidfl} ]]
then
rm "${Pidfl}"
fi
if [[ -f ${Pidf2} ]]
then
rm "${Pidfl2}"
fi
else

ps pidnumber should return success if the process is alive and failure if the process is dead. It also prints text so redirect to /dev/null.

Hi, you are using exec, so the shell executing /udd026/SAS_Progs/IVEREX62.sh will replace the parent script's shell, without creating a new process. So this code:
SCHEDULER_EXIT= $?
echo IVEREX62...