Global search box is not working as expected

Hi All

After upgrading RQM 2.0 to RQM 3.0,  I use the search box to search for the test case that were originally created in RQM 2.0.  Unfortunately, no results will show. But if I search through View Test  Cases by inputting the test case id in the filter, test case can be queried out.                                                              



Any idea / inputs on why not all QM resource can be queried out after such up-gradation and how can we resolve such situations?

Thanks and Regards
Rajesh