The ControlSystem event exclusive list of CS_Process_Events which <i>must not</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 and of the CS_Event_Exclusive events have occurred.  If none have, the <b>event in question</b> may be posted.  Otherwise, the <b>event in question</b> is rejected with <i>Exclusive Violation</i> error.