Hi Brent,
If you enable the simulation validation, you would see that the probability in normal flow should always be 100%, otherwise it can happen, that a process instance will never finish!
To ‘randomize’ for example the start of the message event, you have to set the KPI wait time to any value and you have to use standard deviation. Do the same for the TimeCycle attribute.
The format for TimeCycle and KPI wait time is the following: hh:mm:ss.millis. For example you entered 14:00:00.000 in the TimeCycle attribute, that means, it always waits 14 hours, until this event occurs and in the meantime. For the message intermediate event, it occurs always immediately, since the KPI wait time is set to 00:00:00.
Hope this explanation helps.
Regards,
itp commerce Support