This diagram shows the Product dimension, its two hierarchies, and their components. The top is Total Product (tprod). From top to bottom, the Product hierarchy is Company, Division, Group, Dept, SubDept, Class, Item, and Item SKU. From top to bottom, the Product Cluster Hierarchy is P Cluster, Item, and Item SKU. (Note that for Oracle Retail Data Model for OLAP 11g, this level is named GROUP. However, since GROUP is a restricted keyword for Oracle OLAP 11g metadata, in Oracle Retail Data Model for OLAP 11g, this level has been renamed to GROUP1. The Level Description continues to be Group in both versions.)