Thank you so much Peter,

Yes you are correct I have done it like that, leaving the "=" sign there, now I have deleted the entire row then it worked!!!!

One more small question, now at the left most side of the report I can see that Grouping column, and in each page it will show 1-10 as I have 10 pages. As I don't want to show this column I have selected that column and visibility property is made to false, now it is not showing but when I export to excel, in each page I can see that blank column.

Can we do something (rather than making the column width very very small ? ) so that this blank column wont come in the report out put as well as while exporting to excel?