Viewing SQL Server data(NTEXT column) to Oracle

Hi,
I m trying to connect Oracle 12c to MS SQL (Gateway)
HTRAPORU column is NTEXT type on MS SQL
   SELECT T.HTRAPORUTEXT, T.HTRAPORU,
            T.DURUMID, T.LABOZELNOT, T.SGTARIHSAAT, T.LABKABULTARIHI, T.CALISMABASLAMATARIHI,
            T.CALISMABITISTARIHI, T.ONAYTARIHI, T.RAPORTARIHI, T.SUBEID, T.KILITLI,
            T.MIND, T.MAXD, T.REFD, T.IPTAL, T.ACIL
            FROM HTEST@ESKIDB T
            WHERE HTETKIKKARTID=122477901
            ORDER BY CASE WHEN BARKODNO IS NULL THEN 1 ELSE 0 END, BARKODNO;
I get a query error from my SQL Developer saying:
ORA-00904: "T"."HTRAPORU": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
Error at Line: 2 Column: 29
I tried to use, like "HTEST"@ESKIDB and "T.HTRAPORU" but Problem not resolved
Can anyone help me on this please?
Yasin Polat

I Tried;
SELECT "Durumid" FROM htest@eskidb WHERE rownum= 1;
            ORA-00904: "Durumid": invalid identifier
            00904. 00000 - "%s: invalid identifier"
            *Cause:
            *Action:
            Error at Line: 38 Column: 8
            SELECT Durumid FROM htest@eskidb WHERE rownum= 1;
            Normal Result
            DURUMID
            11
Info: on MSSQL DURUMID=Integer HTRAPORU=Ntext

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