pgadmin III bug - schema prefix missing in return type

When I declare a function with a schema-qualified return type, PgAdmin does
not show the schema in the return type:

Here's what I tell Postgres:
===============================================

CREATE OR REPLACE FUNCTION xxx.packet_data(pg_catalog.numeric, pg_catalog.text)
RETURNS setof xxx.data_tbl AS
'
select * from axxx.data_view
where packet_rec_id = $1
and tag = $2;
'
LANGUAGE 'sql' VOLATILE;

=====================================================
Here is what PgAdmin shows (note the change following the RETURNS)
=====================================================
CREATE OR REPLACE FUNCTION xxx.packet_data(pg_catalog.numeric, pg_catalog.text)
RETURNS setof data_tbl AS
'
select * from axxx.data_view
where packet_rec_id = $1
and tag = $2;
'
LANGUAGE 'sql' VOLATILE;

---
Michael