But in the first action, I give the Cash a value or do I miss understand something?
You have to load the value into the ItemValue. For that you need either the event "On item exist" or the action "Get item". If you use "Get Item" after you set Cash to 1 the value will only available in ItemValue in the next Event not in the same or you use "Wait for previous actions to complete" from System. But it much easier to set the variable Cash to 1.