PLS-00536: Navigation through REF variables is not supported in PL/SQL
Cause: The expression of the form REFVAR.FIELD was entered. This is not supported in this version of PL/SQL.
Action: This navigation is only supported for database objects. The REF variable can be used to insert into a database column of the same type, or select from it. However, you will not be able to navigate through it. Remove the navigation.