After checking my APEX application for errors using the APEX advisor. It mentioned that a select didn't had all required privileges to execute a statement.
I checked the source an got this error message:

Same SQL statement run fine in the corresponding Oracle DB schema within the SQL Developer.
Any idea? At the moment I would just ignore the message.
APEX version: 5.0.2
DB version: 11.2.0.4.0
Best regards
Tobias