YR exes search different properties in different classes of objects
In unit class they search such prop. as 'Primary', 'Secondary', 'Transport', 'DeploysInto' and etc.
In infantry class they don't search for 'DeploysInto' prop. so infantry cannot deploy into structures.
In buildings class exe searchs 'IsGattling','Power','BuildCat' and other options which are not searched in units and infantry.
So if you put some options which 'are not searched by exe' you'll have no result.
Creators of Ra2/YR made codes in exe by minimum. They have opinion that many features of buildings are not for units and they don't need to waste their time
But it would be greate to make gap logic for units or weapons for overlays or gattling for infantry and aircrafts and etc. They didn't care for it, unfortunately.