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
Image may be NSFW.
Clik here to view.
Now using some API you can disable Data Analysis tab
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
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