How to cancel training a unit

[maskedpoptart]

Hey guys,

Quick question: In response to the event "building starts training a unit", how do I cancel training the unit? I can't find a function to do it.
An answer in any code form (GUI/JASS/vJASS) is welcome, but please, do NOT make up a function name that doesn't exist. Yes I know this question requires you to actually open up your world editor, but I will give rep to whoever solves it.

Edit: I solved the problem by doing a test in response to the EVENT_PLAYER_UNIT_ISSUED_ORDER event. When I press the cancel button, I print out the issued order id, which turns out to be 0x000d0008. Then I can cancel training a unit by doing the following:

call IssueImmediateOrderById( udg_buildingUnit, 0x000d0008 )

 

[Lord_Sauron]

Is there a way to cancel units that are later in the build order? Say you want two units to be permitted to train, but due to a condition, the third one in line is canceled.