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

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