Change datasource in existing report

Hi,

I have created a WebI report (SAP Business Objects BI Platform 4.0 Client Tools (version 14.0.2.364)), on top of a BEx query. The report has one crosstab table with additional variables created. I now want to change the original BEx query to a new BEx query. Is it possible to make that change without changing the entire report? Is it possible to change just the underlying query? Please help! Thanks!

-Janice