The ControlSystem event path is a list of CS_Process_Events which <i>must</i> have occurred before the <b>event in question</b> may be posted to CS_Cases .  
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The ControlSystem checks the CS_Process_Events history to see if the one of the CS_Event_Path events has occurred.  If it has, the <b>event in question</b> may be posted.  Otherwise, the <b>event in question</b> is rejected with <i>Path Violation</i> error.