I created an upgraded item that requires 5 basic items and a recipe to make, like so:

Code:
"ItemRequirements"
		{
			"01"						"item_hyperstone_rook;item_sacred_relic_rook;item_blossoming_stone_rook;item_void_stone_rook;item_quelling_blade"
		}
When I click on this item in the shop, a CTD occurs.