Permanent Item Removal

I got this merchant, that has X items, the merchant despawns at night, and respawns at the morning... it has X amount of items it always has, but then I have a trigger that has Y% chance to add Z new items. The thing is, eventually, the shop would run out of space, so in order to keep that from happening, I want the shop to remove the items bought PERMANENTLY from the list of items the shop sells... I found the trigger that "should" do it, but it doesn't...

I think it only sets the amount in stock to 0. :|

The trigger is something like:

Events
- Unit sells an item (from shop)
Conditions
- Unit-Type of (Selling Unit) is Treasure Hunter
Action
- Remove (Sold Item) from Treasure Hunter

I know that the 'Remove (Item) from (Shop)' trigger only works on items added with the 'Add (Item) to (Shop)' trigger. Might this be your problem?

Oh, so it can only remove items that I have added to it with triggers? If that's the case, then it works fine :)

Doesn't matter if it doesn't remove the default items, its the new items that are important to remove, as they are "bonus" items.