I am trying to create a custom security profile in Oracle HRMS. So I went to the 'Security Profiles' screen -> Custom Security tab, check the 'custom restriction' check box and begin typing my SQL where clause. Here is my question:I type this:ASSIGNMENT.grade_id not in ( select grade_id from per_grades where PER_GRADES.NAME not like 'G%' or PER_GRADES.NAME not like 'M%') and it all works fine.However, if I type per_all_assignments_f instead of ASSIGNMENT, I get ORA - 00904 error. Why does this happen? How will I know what alias to use in case I want to include a different table in the query?

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