Lua Check if target item is on backpack

[Evil Puncker]

How do I check and allow the use of an item onUse action to be performed only if target item is in character backpack, not anywhere else:

function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    if target.itemid == 2782 then
        target:transform(2781)
        target:decay()
        return true
    end
    return destroyItem(player, target, toPosition)
end

I'm using TFS 1.3 latest one

 

[slavi]

You can use targetItem:getTopParent() == player to check if the item is held by the player.

Sincerely,
Slavi