dblinks and tnsnames error

Tenho q analisar mais isso.


tnsnames.ora

MAP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.143.112.23)(PORT = 1521))
)
(CONNECT_DATA =
(SID = MAPE)
)
)


MAP.WORLD =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.143.112.23)(PORT = 1521))
)
(CONNECT_DATA =
(SID = MAPE)
)
)

tanto antes como esse:


MAP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.143.112.23)(PORT = 1521))
)
(CONNECT_DATA =
(SID = MAP) -- nao existe
)
)


MAP.WORLD =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.143.112.23)(PORT = 1521))
)
(CONNECT_DATA =
(SID = MAP) --nao existe
)
)

Resultados do
select * from all_db_links where username='MAPDBA'

owner
PUBLIC
db_link_name
MAPE_PROD.WORLD
username
MAPDBA
host
MAP 7/12/2005 10:54:04


Erro de tnsnames:
TNS: could not resolve service name.



PQ?