Rename Identifier does nothing when trying to rename test_1:
CREATE OR REPLACE PACKAGE BODY xxx AS
PROCEDURE test_1 AS BEGIN NULL; END test_1;
END;
It works within an anonymous block (except for the procedure name after END):
DECLARE
PROCEDURE test_1 AS BEGIN NULL; END test_1;
BEGIN
test_1;
END;
results in
DECLARE
PROCEDURE test_2 AS BEGIN NULL; END test_1;
BEGIN
test_2;
END;