Orion Alerting Problem

I'm using Orion NPM v9.5 SP2.  My problem is in the Configure Advanced Alerts.  I setup an Advanced Alert to notify when node memory utilization > 90%.  My Trigger Condition has a complex condition=Percent Memory Used is greater than value 90, and a second complex condition=(custom property of NotificationGroup) contains UNIX (this is because I want to notify a certain group of people for this node).  This by itself works well.  But I need to exclude a few nodes.  In Alert Suppression I add a complex condition=Node Name contains dwd.  Here I want to exclude all nodes that contains "dwd" in the node name.  But it appears to exclude ALL nodes or this Advanced Alert no longer works.  What did I do wrong?   Thanks!