ORA-00957---重复的列名

帮忙看看为什么会报这个错：
CREATE OR REPLACE PROCEDURE PRO_SBSJHZ2 Authid Current_User IS

V_SQL VARCHAR2(20000);

CURSOR CURSOR_1 IS SELECT DISTINCT T.Khxmbm,T.khxmmc FROM VW_SBSJHZ2 T ORDER BY T.Khxmbm;

BEGIN

  V_SQL := 'SELECT JGMC ';

  FOR V_khxmmc IN CURSOR_1

  LOOP

    V_SQL := V_SQL || ',sum(case khxmmc when ''' ||  V_khxmmc.Khxmmc || '''then tjsl else 0 end) as '
    ||V_khxmmc.Khxmmc;

  END LOOP;

  V_SQL := V_SQL || ' FROM VW_SBSJHZ2  group by JGMC';

  DBMS_OUTPUT.PUT_LINE('1---'||V_SQL);

  V_SQL := 'CREATE OR REPLACE VIEW RESULT_SJSB  AS '||  V_SQL;

  EXECUTE IMMEDIATE V_SQL;


END;