Need some help with unstackable items system

[Vladimerge]

So i want to make it so that when a unit that has "claws of attack" picks up the same item it will drop that item and keep only 1. I dont know JASS so i used triggers.

Trigger

• Items
  • Events
    • Unit - A unit Acquires an item
  • Conditions
    • ((Triggering unit) is A Hero) Equal to True
  • Actions
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • ((Item being manipulated) is owned) Equal to True
      • Then - Actions
        • Hero - Drop (Item being manipulated) from (Hero manipulating item)
        • Game - Display to (All players) for 2.00 seconds the text: ((Name of (Owner of (Triggering unit))) + you allready have this item!)
      • Else - Actions
        • Do nothing

 

[deathismyfriend]

there is an Item Restriction system on the hive. That should do exactly what u want. http://www.hiveworkshop.com/forums/spells-569/jass-item-restriction-system-irs-v1-0b-232064/
also get rid of the do nothing action. its useless.
This tutorial will explain y and may help u with some other things. http://www.hiveworkshop.com/forums/tutorial-submission-283/things-gui-user-should-know-233242/