something very easy: I have a filter Web Part (data from SSAS) and a Excel sheet with a Pivot table getting some data from the same cube... I have a filter in the pivot table for the year... So I have defined the filter web part to display the years from the same dimension I used for the pivot table's filter.
The idea was to have multiple excel files on a dashboard and all are filtered by year using the filter web part.
The question is: What do I have to do in Excel to define that the filter web part can overwrite the filter in the Pivot table? What do I have to do to link the Excel files (running in Excel Services) to the Filter Web Part?