Infoset Prompts disappears in Crystal Report

I created several Crystal Reports which access InfoSet of R/3 4.6 system and table from Oracle Database.

The Crystal reports work fine as long as they access either Infoset Query or Database only. But when we combine a Oracle table to the Infoset Query on CR level, the parameters from Infoset disappear with

Database Connector Error:"RFC_CLOSED".

Any idea why it could happen? Please advise.

Database only  -> Works !!

Sample with Label Id Infoset only --> Works !!

Report parameter to the report above --> Works !!

Added an Oracle  Table data to the report above

The parameters from the Infoset disappear!with the below Error.

Thanks,

Tilak