Re: function retuning refcursor, order by ignored?

While a hard coded order by clause works; passing the order by as a param is
ignored as I've implemented below.  The order by value is being passed as
expected (tested by outputing the value in a column). I've called like so:

ups=# begin;
BEGIN
ups=# select proc_item_list(1,true,'item_id');
   proc_item_list
---------------------
 <unnamed portal 12>
(1 row)

ups=# fetch all from "<unnamed portal 12>";


CREATE or REPLACE FUNCTION "public"."proc_item_list"(
IN "pint_org_id" int4,
IN "pbool_active" bool,
IN "pstr_orderby" varchar)
RETURNS "pg_catalog"."refcursor" AS
$BODY$
DECLARE
     ref refcursor;
BEGIN
     OPEN ref FOR SELECT item_id, item_name, item_org_id, item_active
          FROM public.t_item
          WHERE item_org_id = "pint_org_id" and item_active = "pbool_active"
          ORDER BY "pstr_orderby";
     RETURN ref;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;

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