The position in which you drop the chart determines the
statistics that you can visualize. In this example, the chart is a child of the
Table book, which provides access to the Columns sub-object collection. To
analyze tables or any other collection of standard objects, you should drop the
chart at the top level of your report. You can base a chart on any of the
standard collections in the PowerDesigner metamodel, or create you own extended
or calculated collection to analyze (see
Customizing and Extending PowerDesigner > Extension Files).