Shared variable returns 0 in the main report. However I can see the correct values in subreport.

I am trying to compare values in a column in main report with that of a subreport. I created a shared variable and the values are display properly in the subreport. Now When I create a shared variable in main report, it shows 0. I have made sure that subreport is in the section above shared variable in main report. Does suppressing the subreport might be creating that problem? I do not want to display the subreport. If I do not suppress the subreport, the report is too big to be displayed. Can anyone help?