Datareport and Datasource property

Hello,
I have a datareport whose datasource property i set at run time. The thing is i want to include data from 4 tables to report a member's profile. i created unbound controls for the first part of the profile, which is basic info .that basic info comes from tbl basicinfo. i set datafield of the unbound controls and they work fine. Now, i want to place educational info which is eduinfo tbl. when i try to set the datasource back to that, it fails saying.


any idea how to do that?

sam