Multiple grids can be included in a report, where one or more of the grids are affected by changes to those dimensions on the user POV.
Notice in the following figure, the two grids look identical, but have different values for Measures->Year.
If you go back to the Report client and turn on the grid POV, you see that the members for Product, Market, and Scenario have been set for Grid2. Thus, a user changing any of those dimensions in the Reports Designer workspace has no effect on Grid2.
Therefore, it is probably useful for the designer of the report to indicate the user of page dimensions in a text box or row/column headers.
