How to use Drill-Through correctly

Edit Subject

Hi,
I ́m creating a plan for a Oracle 9i table and I ́d like to use Drill-Through functionality.
In my test I ́m using a table called "INSTALACAO" inside "DLQ_PROD" database.
I ́ve clicked in "Enable Drill-through" option and set "DLQ_PRD" in "Database name:" text box.
In "Table prefix" I ́ve put "INSTALACAO" once and after I left in blank, but the problem is that always when I run my plan, I receive the following message:
"[WARNING] Unable to start drill-through.[STEP Profiler[Profiling]]"

What can I do to solve this problem?

Thanks