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The model has a time table that stops object from 8:00-8:05am and 8:15-8:40am. To mimic dynamic adding of member I've done the following steps:
a) model start time at 8:00am. run model and stop it anytime before 8:05am
b) run the script command to clear time table and add member to time table
c) continue to run model and exception will be seen.