picking up item spawns hostile

[QueersOfWar]

i have a trigger already -

• Events
• Unit - A unit acquires an item
• Conditions
• (Item-type of (Item being manipulated)) Equal to Item
• Actions
• Unit - Create one Enemy at (Center of Playable Map Area)

How do i make it so that if you drop the item and pick it up again, the enemy will not spawn again?

 

[Garfield1337]

• Item
  • Events
    • Unit - A unit Acquires an item
  • Conditions
    • (Item-type of (Item being manipulated)) Equal to Tome of Experience
    • Boolean Equal to False
  • Actions
    • Unit - Create 1 Footman for Player 1 (Red) at (Center of (Playable map area)) facing Default building facing degrees
    • Set Boolean = True

Boolean is variable of type boolean.

 

[QueersOfWar]

very nice, thanks so much