The database has changed since the report was written. Reselect location in the report and refresh the links to the database. Check and make sure that every table referred to in the report actually exists in the database. Save it. Write the CRD schedule with the saved report.
This is the mostm common reason and fix.
Other reasons and fixes are shown at http://support.businessobjects.com/search/results.asp?q=table+not+found&start=0&access=p&q2=&summary=1&getfields=*&sort=date%3AD%3AL%3Ad1&output=xml_no_dtd&ie=UTF-8&client=support_external&content_typ=all_support&filter=0&site=all_support&oe=UTF-8&proxystylesheet=support_external&ip=192.168.180.151&ct=livewww-all&num=10
