SQL & PL/SQL :: Unable To Override Parent Procedure

--Create a parent object
CREATE OR REPLACE TYPE PARENTOBJ AS OBJECT
(
FIRST_NAME VARCHAR2(50),
static function GETNAME return varchar2,
MEMBER PROCEDURE getoutput
)
NOT FINAL;
/

----Create the body for parent object type
CREATE OR REPLACE TYPE BODY PARENTOBJ AS
static function GETNAME return VARCHAR2 IS
BEGIN
RETURN 'PARENTOBJ';
END ;
MEMBER PROCEDURE getoutput iS
BEGIN
DBMS_OUTPUT.PUT_LINE( 'Hello world from '||PARENTOBJ.getname );
END ;
END;
/

--Create a child object
CREATE OR REPLACE TYPE CHILDOBJ UNDER PARENTOBJ
(
static function GETNAME return VARCHAR2,
--override the parent method
OVERRIDING MEMBER PROCEDURE getoutput
)
FINAL;
/

----Create the body for child object type
CREATE OR REPLACE TYPE BODY CHILDOBJ AS
static function GETNAME return VARCHAR2 IS
BEGIN
RETURN 'childobj';
END ;
--override the parent method
OVERRIDING MEMBER PROCEDURE getoutput IS
BEGIN
DBMS_OUTPUT.PUT_LINE( 'Hello world from '||CHILDOBJ.getname );

END;
END;
/

The above types are created with no issues. However, when I am trying to inherit the child method and override its parent, I am getting the follwoing error:-

--NOW INHERIT THE PARENT INTO CHILD, AND OVERRIDE THE PARENT METHOD BY CALLING THE CHILD METHOD
DECLARE
OBJ PARENTOBJ;
BEGIN
OBJ := NEW CHILDOBJ(NULL);
DBMS_OUTPUT.PUT_LINE('obj method getoutput() = ' || GETOUTPUT());
END;
/

ORA-06550: line 6, column 56:
PLS-00201: identifier 'GETOUTPUT' must be declared
ORA-06550: line 6, column 3:
PL/SQL: Statement ignored