12. The method of claim 1 , wherein the related items comprise different types of items positioned at a same level of the category hierarchy as the item.
12. The method of claim 1 , wherein the related items comprise different types of items positioned at a same level of the category hierarchy as the item. 17. The computer-readable medium of claim 12 , wherein a type of item in the plurality of types comprises an internal type, the internal type including an item that is offered internally by the enterprise in the procurement catalog.