A cross tab must use data from a cube. A chart can use data from a data set or from a cube. If you create a cube for a cross tab and you want to display the same data in a chart, set up the chart to use the cube. Cube data is appropriate for a chart because a cube organizes data into dimensions (groups) and measures (aggregate data), which map well to a chart’s category series and value series. A cross tab and a chart that use data from the same cube can sort and filter their data differently.