How can I delete a member function created inside oracle type object without dropping the entire type?
I never used it but according documentation you might be able to use
alter type {type_name} DROP MEMBER {function_spec} CASCADE;
Note, {function_spec}
is the function name plus RETURN clause, e.g.
ALTER TYPE ttest DROP MEMBER FUNCTION f_name_2 RETURN VARCHAR2 CASCADE;
Afterwards you have to re-create the TYPE BODY without the dropped function, i.e. CREATE OR REPLACE TYPE BODY ...