polymorphic function in 7.4 vs. 8.3 - Mailing list pgsql-sql

I have the following setup which works great in version 8.3 but throws an 
error in 7.4:


CREATE TABLE atest1
( id integer NOT NULL, descr text, CONSTRAINT atest1_pkey PRIMARY KEY (id)
);



CREATE OR REPLACE FUNCTION test_trg() RETURNS "trigger" AS
'
DECLARE   any_rec wfsys.atest1;   
BEGIN
any_rec.id := NEW.id;
any_rec.descr := NEW.descr;
select into any_rec * from dd_test(any_rec);
--any_rec := dd_test(any_rec);
RETURN any_rec;
END;
' LANGUAGE 'plpgsql' VOLATILE;


CREATE OR REPLACE FUNCTION dd_test(anyelement) RETURNS record AS
'
DECLARE   any_rec alias for $1;   some_row record;
BEGIN   some_row := any_rec;   if some_row.id < 0 then       raise notice ''id is < 0!'';       some_row.descr :=
''someother value'';   end if;
 
RETURN some_row;
END;
' LANGUAGE 'plpgsql' VOLATILE;

CREATE TRIGGER trg_atest1 BEFORE INSERT ON atest1 FOR EACH ROW EXECUTE PROCEDURE test_trg();

Finally, firing the trigger like so:

insert into wfsys.atest1 values(123, 'some text');

Gives the following error:

ERROR:  column "any_rec" does not exist
CONTEXT:  PL/pgSQL function "test_trg" line 7 at select into variables


********** Error **********

ERROR: column "any_rec" does not exist
SQL state: 42703
Context: PL/pgSQL function "test_trg" line 7 at select into variables


It works great on 8.3 (my dev server),  but throws the error on the machine I 
am forced to work with, which is running version 7.4. I realize that 
polymorphic functions were pretty new in v7.4, is there a workaround or am I 
making a silly mistake? Or both? 

Incidentally, I get the same error when I change the polymorphic function's 
argument from "anyelement" to "wfsys.atest1" so it seems that it is occurring 
in the trigger function.  Thanks for any help.

Richard