Here is the one in my server.
function onUse(cid, item, fromPosition, itemEx, toPosition)
if(itemEx.itemid == 2739) then
doTransformItem(itemEx.uid, 2737)
doCreateItem(2694, 1, toPosition)
doDecayItem(itemEx.uid)
return true
end
return destroyItem(cid, itemEx, toPosition)
end