Error when changing datasource location "Some tables could not be replaced"

I currently upgraded from Crystal XI to XI SP6. Reports that were originally built in Crystal 8.5 were converted by opening from within Crystal XI, refreshing, and saving. Reports seem to have converted properly. However, when tyring to set data source location from a production database, to a test db (exact copy of production), I'm getting the following error message: "Some tables could not be replaced, as no match was found in ghte new data source. Please specify the table required for any unmodified tables." Please note that my ODBC drivers have been properly set up and tested. What's causing this and how to fix?