Hi Ashwin
There are ways ->( I have not tried it)
1)Disable Double click in that excel report using macro..
or
2)Under Expand button -> Custom Expand select some level which is not present in your dimension as shown
Now using some API you can disable Data Analysis tab
Please check more on this..
or
3)Task profile which disable this feature..
I tried to check any task profile related to it but couldn't find..
JAck