The database user in the application connection must have SELECT permission on the source tables accessed in the session. If this database user is not the owner of the source tables, enter the table owner name in the session as a source table prefix.
If the mapping contains a Source Qualifier with an SQL Override or an Application Source Qualifier with an extract override, the PowerCenter Integration Service ignores the table name prefix setting for all connected sources.
To enter a source table prefix in the session:
In the session properties, click a target on the Mapping tab.
Enter the owner name in the Table Name Prefix field for each listed table.