1. A cross-list product can exist in two places in the product hierarchy.
2. Cross-listing is the act of placing the same piece of data in multiple locations in the data architecture.
In PIM architecture, cross-listing is used when a group of products can logically exist in two places in the product hierarchy allowing more ways for users to access the group of products. Cross-listing is used to avoid creating duplicate information in product hierarchies. Not all PIM systems can support cross-listing.