You want to make a Hero spell into an Item ability ? :S
Just untick "Hero ability" and tick "Item ability" in the Object Editor and it'll be an Item ability
But, if you mean you have a trigger for it, then please first post your code
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.