BUG? VIEWS with INSTEAD OF triggers are updatable????

Question

When I try to update the view created with the PL/SQL code from
below, with an infobus data form generated by JDev wizards , i
ontain this error "ORA-22816: unsupported feature with RETURNING
clause"
Below this text are an plus80 sql text file, producing the same
error and creating the database environment required.
It creates :
.-2 tables,
.-2 sequences
.-a joined view of this 2 tables
.-an "instead of insert" trigger on the view
Demostrating the correctness of this code there are a
normal insert alone, and a pl/sql block producing the same kind
error from plus80.
If you generate the form to edit this view, it produces the same
error when trying to do an insert, that the error produced by
this sql file.
--------------------------------------------cut here
drop sequence suf_seq;
CREATE SEQUENCE SUF_SEQ
NOMAXVALUE
NOMINVALUE
NOCYCLE
NOCACHE
drop sequence fam_seq;
CREATE SEQUENCE FAM_SEQ
NOMAXVALUE
NOMINVALUE
NOCYCLE
NOCACHE
DROP TABLE SUBFAMILIAS CASCADE CONSTRAINTS;
CREATE TABLE FAMILIAS
(ID NUMBER(6,0) NOT NULL
,DESCRIPCION VARCHAR2(50) NOT NULL
,ACTIVO NUMBER(38)
,USERALTA VARCHAR2(15)
,FECHAALTA DATE
,USERMOD VARCHAR2(15)
,FECHAMOD DATE
DROP TABLE FAMILIAS CASCADE CONSTRAINTS;
CREATE TABLE SUBFAMILIAS
(ID NUMBER(6,0) NOT NULL
,FAM_ID NUMBER(6,0)
,DESCRIPCION VARCHAR2(50) NOT NULL
,ACTIVO NUMBER(38)
,USERALTA VARCHAR2(15)
,FECHAALTA DATE
,USERMOD VARCHAR2(15)
,FECHAMOD DATE
set serveroutput on;
create or replace view test ( fam_id , suf_id , fam_descripcion
,suf_descripcion) as
Select fam.id,suf.id,fam.descripcion,suf.descripcion
from familias fam,subfamilias suf
where fam.id=suf.fam_id;
CREATE OR REPLACE TRIGGER test_insert
INSTEAD OF INSERT
ON test
declare
auxFam_Id familias.id%type;
auxSuf_Id subfamilias.id%type;
begin
select fam_seq.nextval,suf_seq.nextval into
auxFam_id,auxSuf_id from dual;
insert into familias(id,descripcion) values
(auxFam_id,:NEW.fam_descripcion);
insert into subfamilias(id,fam_id,descripcion)
values(auxSuf_Id,auxFam_id,:NEW.suf_descripcion);
end;
show errors;
/* here is a non returning insert everything works ok */
insert into test(fam_descripcion,suf_descripcion) values
('familia test 1','subfamilia test1');
declare
aux RowId;
-- aux subfamilias.id%type;
begin
insert into test(fam_descripcion,suf_descripcion) values
('Familia test 2','Subfamilia test 2') returning RowId into aux;
dbms_output.put_line(aux);
--select * from subfamilias;
--delete from subfamilias;
end;
-------------------------cut here
null

Answer 1

Are INSTEAD OF triggers the only way to insert/update
information from a form using a view that combines
fields from two different tables? My goal is to try
to get away from using so many triggers and contain
as much as I can within HTML DB. Is this really the
only way?While you might be intimidated by the seeming complexity of an instead-of trigger, in the long run you'll be glad to dug in and did it the right way. The instead-of trigger is a thing of beauty where databases are concerned.
One thing to be careful about: when you attach a trigger to a view and recompile the view, if it has 'CREATE OR REPLACE' in the definition, any triggers defined for the view will be lost. All your hard work creating that elegant trigger could be gone in a keystroke.
Either use 'CREATE' without the 'OR REPLACE' or save a copy in your script repository or someplace safe so you can recreate it the event that it 'goes away' unexpectedly.
As always, this is only my experience. Your mileage may vary. Perhaps you're smarter than me and have a nice trick you'd like to share for preserving such things in a more elegant way??
Earl