[Solved] Can someone explain cargo hold?

[Sunchips]

I read that adding Cargo Hold to a unit will make the unit unable to perform autoattacks. However I tried this and it proved to be false. First I tried adding it to a unit through a trigger and then I tried with the unit having the ability initially and it did absolutely nothing. Is it patched or something? And is there another way to make a unit unable to perform autoattacks?

Edit: There are several versions of the Cargo Hold and I realized I had to use Cargo Hold (Orc Burrow) to get this to work. Problem solved