Is it possible to do classoverride on the weapon

I'm trying to make an item that utilizes weapon class slot so I'm interested in renaming it. Is it possible?

 

It's suposed to be, but for some reason it's sometimes not
I think it might depends on the weapon type (i think it works on maces but not swords, but I'm not 100%)

 

I tried on crossbows and it doesn't work. Thanks for the info anyway.

 

Crossbows are treated differently from other weapons.