sql_mode="oracle" EXECUTE IMMEDIATE statement with USING IN is not supported

CREATE OR REPLACE PROCEDURE         SP_UPDRSPRESULT(

    I_RSP_NO  VARCHAR2,

    I_RESULT  VARCHAR2,

    I_POINT   VARCHAR2,

    I_LEVEL   VARCHAR2

)

IS

    VSQL    VARCHAR2(1000);

BEGIN

    VSQL := '';

    VSQL := VSQL || 'UPDATE /* APL-020000140 */ HAPPY_ASSIGN_CLNT A ';

    VSQL := VSQL ||  'SET A.ASSIGN_POINT = :1 ';

    VSQL := VSQL ||    ', A.ASSIGN_LEVEL = :2 ';

    VSQL := VSQL ||    ', A.RESULT_CD    = :3 ';

    VSQL := VSQL ||    ', A.RECEIVE_DT   = SYSDATE ';

    VSQL := VSQL ||    ', A.UPDATE_DT    = SYSDATE ';

    VSQL := VSQL ||    ', A.UPDATE_PRG_ID = ''RB_RSPRESULT'' ';

    VSQL := VSQL || 'WHERE A.RSP_ASSIGN_NO = :4 ';

    VSQL := VSQL || '';

    EXECUTE IMMEDIATE VSQL USING IN I_POINT, I_LEVEL, I_RESULT, I_RSP_NO ;

    IF SQL%ROWCOUNT <> 1 THEN

      DBMS_OUTPUT.PUT_LINE('WARN:·ë²Ì¹¹¿·ÂоÝ̵¤· RSP_NO=' || I_RSP_NO ||' ·ë²ÌCD=' || I_RESULT);

    END IF;

EXCEPTION

  WHEN OTHERS THEN

    DBMS_OUTPUT.PUT_LINE('WARN:ORACLE_ERROR RSP_NO=' || I_RSP_NO ||' ·ë²ÌCD=' || I_RESULT);

    RAISE;

END;