Many IT professionals working with Microsoft System Center 2012 Service Manager have to extend the default Service Manager classes. The one of the most common cases is adding a new property with the type of Enumerator (List) and an appropriate outrigger for Data Warehouse. The extending of the existing classes is quite simple and straightforward. However, it is easy to run into a problem if you use the custom list (enumerator) and want to see it in the OLAP cubes.