Message Oracle ORA-38815 - ALTER SESSION SET EDITION must be a top-level SQL statement

ERRORALTER SESSION SET EDITION must be a top-level SQL statement
CAUSEAn edition switch failed because it was executed from a PL/SQL block or using recursive SQL.
ACTIONExecute the statement from a top-level OCI call, or use dbms_session.set_edition if its deferred effect is appropriate.