Discoverer 10.1.2.55.26 Viewer Shows NULL instead of Blank

Hello All,
we recently installed Discoverer 10.1.2.55.26 and applied cumulative patches(CM4). we migrated 9.04 version reports to Discoverer 10g(10.1.2.55.26).
On all the Reports, we see NULL instead of Blank spaces in the data in the viewer. How can we change all of the reports to show blank space instead of NULL.
Please share your experience and thoughts on this Issue
Thank you
Chandu Ambati

Thank you Tamir,
Before i try on the big bang approach. I tried changing the worksheet options for one of the worksheet that shows NULL.
I changed from NULL to blank space and saved the workbook.
we use Oracle Portal to show these workbooks as Portal Views. Portal View was showing NULL before the change, and after changing the worksheet options and saving it, i refreshed the portal view and it started showing Blank instead of NULL. Works fine for that day.
The next Day again it started showing NULL.
Do u think are we missing any step?
Thanks again for your help.
Chandu Ambati

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