The Forecast/Actual report gives a listing of SKUs with a comparison of the forecast and actual demand over a 12 month period. This report can give a clear indication as to whether or not the Mars configuration is set to optimal values. There are many settings in Mars that can fine tune the performance of the demand forecast to better reflect reality.
The normal filtering options are available (Super Vendor, Vendor, Location, Group 1, Group 2, Item) for the report as well as options to include non-stock items (X-Items)