how do u cancel a structure in building?

or cancle a unit training
cancel a research?

as in, i detect someone is trying to build/train, and then order him to cancel it...

if you want to cancel thebuild order, you can do this:

Event
A unit owned by player1 is issued an order (dont know with or without target, figure that out)
Conditions
Issued order equal to Barracks
Actions
Order (ordered unit) to stop

That would instantly cancel the build order (which would be pretty frustrating to the player though :ggani: )

There's also a train/upgrade event, you can also cancel that by issuing the stop order I assume.