Syntax to query a MSSQL 2008R2 linked server from Oracle

Hi,
    I would know if it's possible to query a MSSQL 2008R2 linked server from Oracle. Actually I can query local MSSQL databases from Oracle using dg4odbc without problem but how can I query the linked servers configured on the MSSQL side ?
From MSSQL, I can query those linked servers using the [linked server name].[catalog].[owner].[table] syntax but using select * from [linked server name].[catalog].[owner].[table]@oracle_dblink_name syntax from the oracle side throw this error:
ERROR at line 1:
ORA-00933: SQL command not properly ended
I tried some syntax variations, e.g. putting double quotes around the object name without luck. After some hours to find a solution I'm out of idea...
So please if someone had a clue on this it would be very helpfull.
Some info:
Oracle 10g 10.2.0.5 Enterprise Edition x64
Oracle Linux 5.9 Enterprise Edition x64
MSSQL 2008R2 Enterprise x64
Windows Server 2008R2 Enterprise x64
Oracle 11gR2 Enterprise x64 for dg4odbc on MSSQL side
SQL Server Natice Client 10.0 used as ODBC driver

Hi kgronau,
                Maybe I'm not clear in my explanations, sorry.
I want, from Oracle, to query a MSSQL linked server.
Basically I want to do that, if possible:
Oracle --> MSSQL --> linked server --> MSSQL
    ^                                                         ^
    |                                                          |
    ---------------->------------------->--------------------
and maybe have a clue about the syntax to be used.
Knowing that querying the linked server directly form MSSQL is working and querying from Oracle to local MSSQL db is working too.
Using the right syntax should lead me to succes, am I right ? Or maybe its something that cannot be done using oracle dblinks ?
Thanks

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