MERGE INTO RECEIVE_MONTH MON                           
USING (SELECT * FROM RECEIVE_MONTH WHERE MEMBER_ID = ?
        AND ITEM_CD = ? AND REQ_YM = ?) S_MON   
ON(S_MON.MEMBER_ID = MON.MEMBER_ID)
WHEN MATCHED THEN                          
    UPDATE SET RECEIVE_AMT = ?
WHEN NOT MATCHED THEN                   
   INSERT (MEMBER_ID , ITEM_CD , REQ_YM, RECEIVE_DT, RECEIVE_AMT, CONTAC_TEACHER_BE_CD,
   CONTAC_TEACHER, RCPT_TEACHER_BE_CD, RCPT_TEACHER, FIR_RCPT_TEACHER)
   VALUES ( ?,?,?,?,?,?,?,?,?,?)  ; 

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쿼리를 돌리면 되지가 않아요..ㅠㅠ

웹상에서 뿌리면 UPDATE는 되는데 INSERT가 안됩니다..

이유가 뭘까요..?

아시는분 도움 좀 주세요.