Works as SELECT but not as a VIEW

This doesn't seem right:

CREATE VIEW inci AS
SELECT date, inci_id, protocol, a.ip_addr, b.ip_addr, spt, dpt
FROM (SELECT addr_id, ip_addr FROM addrs) AS a
JOIN incident ON incident.source_addr_id = a.addr_id
JOIN (SELECT addr_id, ip_addr FROM addrs)
AS b ON incident.destination_addr_id = b.addr_id
JOIN protocols USING( protocol_id );

Produces: ERROR: column "ip_addr" duplicated

Yet the select on it's own works just fine... I've attached the database
definition.

version

-------------------------------------------------------------------------------
--------------------------
PostgreSQL 8.0.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.3.2
(Mandrake Linux 10.0 3.3.2-6mdk)

Thanks,
Rob

--
12:31:42 up 24 days, 14:10, 6 users, load average: 3.08, 2.63, 2.63
Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004