If the database user names and passwords of otherwise compatible connections do not match, you must provide additional information to make the connections compatible.
To make the connections pushdown compatible, perform the following actions:
Verify that the database user of the active database has read permission on all idle databases.
Enable the Allow Pushdown for User Incompatible Connections session property.
For each idle connection to Microsoft SQL Server and Sybase, you must also specify the database name in the connection property and table owners for all lookups and sources.