@RogerCooper Are you saying that you don't have a '<relationshipInitialize>' section? It relationship are not initialize then there is nothing to set. That is why the trigger is falling. I have tried to set a tank unit to transport infantry, but if I didn't set "isLandTransport" then the trigger would fire but nothing would happen. But if I set "isLandTransport" to false then the trigger would change it to true. Hope this is helpful. Cheers...