ocr: Time dimension Product dimension Time key Product key Product key Shipto dimension description Shipto - key brand Shipmade key Ship made dimension category Shiptrom key Shipfrom dimension flavor invoice. num pkg_type Qty_shipped SKU# Lineitem value etc. Figure 1. A typical manufacturing shipments schema with five dimensions, showing the Product dimension expanded. In this article I show how to track a meaningtul change of the package type pkg_type) attribute over time when the OLTP system refuses to change the master product key (SKU #).