"Include new items in manual filter" for Report Filters and OLAP

[turtlekoala]

Hi,

I have a cube backed by an SSAS database, and when I have fields in the Report Filter section, the "Include new items in manual filter" option is greyed out. Does anybody know why this is and if there is a way to get it to work? When they are in the Row Filter or Column Filter section, the option is available. Also, when I create a regular pivot table backed by data in my workbook, the option is available. I'm using excel 2010.

Thanks,
TK