Currently updating bunch of crystal reports (weekly), the database is located in Oracle Server. I have 3 reports that made the access to the database (after F5-Refresh) and were updated.
But surprisingly, the problem for most of the reports remaining Crystal prompted a window ODBC (RDO) with "Data Source Location"Choose a data source from the list or open a file dsn.."

I tried to set the data source location/and make a new connection but still the same requirement prompted me after pressing F5-refresh in crystal.

details it may help you to analyze the problem :

Oracle Database 10g Enterprise Edition Release - 64bi