ALTER SESSION SET plsql_warnings = 'ENABLE:ALL' 

CREATE OR REPLACE PROCEDURE plw5004 AUTHID DEFINER 
IS 
   INTEGER   NUMBER; 
 
   PROCEDURE TO_CHAR 
   IS 
   BEGIN 
      INTEGER := 10; 
   END TO_CHAR; 
BEGIN 
   TO_CHAR; 
END plw5004;