External Table to Internal table Data update query

Hi all ,
I have Follwoing 2 tables one is external oracle and 2nd is internal and both table have the same data as following this is sample data while actual table contains millions of record.
External Table name SE2_EXT
        GL_REF_NO     GL_CUST_ID     GL_TRAN_AMT_LCY     GL_REVERSAL_MARKER     GL_GL_ID     GL_LOCAL
1     5          513557               100               136340003678088.020001
2     5          513557               -100          R     136340003678088.020002
3     1          26               -685.12               136340003674772.030001
4     1          26               685.12          R     136340003674772.030002
5     4          500539               100               136340003477900.000001
6     4          500539               -100          R     136340003477900.000002
7     23          604612               182.15               136340003578165.170001
8     23          604612               -182.15          R     136340003578165.170002
9     76          232033               -230.7               136340003576922.100001
10     76          232033               235.7          R     136340003576957.010001     I want to update GL_LOCAL column with 'R' with conditions that if
WHERE GL2.GL_GL_ID=GL2_EXT.GL_GL_ID
AND GL2.GL_REF_NO=GL2_EXT.GL_REF_NO
AND GL2.GL_CUST_ID=GL2_EXT.GL_CUST_ID
AND GL2.GL_REVERSAL_MARKER IN ('R',NULL)
AND GL2.GL_TRAN_AMT_LCY=GL2_EXT.GL_TRAN_AMT_LCYbut the tricky thing is GL_TRAN_AMT is one time - (minus) and one time +(plus). I only want to update those record who have same TRAN_AMT_LCY with same other condition mentioned above.
I tried merj statement but it did'nt work.If any body help me i would be appriciated.
MERGE INTO SE2 A
USING ( SELECT GL_REF_NO,GL_CUST_ID,GL_TRAN_AMT_LCY,GL_REVERSAL_MARKER,GL_GL_ID FROM GL2_EXT) B
ON (A.GL_GL_ID=B.GL_GL_ID AND A.GL_CUST_ID=B.GL_CUST_ID)
WHEN MATCHED THEN
UPDATE
SET A.GL_LOCAL_A1=B.SE_LOCAL

Why is it tricky? You did not say.
Making a guess as to the problem why not use TO_NUMBER to cast the string?

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"COMPANY_VN" VARCHAR2(15),
"IL" VARCHAR2(17),
"TERMINAL" VARCHAR2(8),
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"AMOUNT" NUMBER(15,2),
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"TIME" VARCHAR2(11),
"TEL_NO" VARCHAR2(25),
"ADDRESS" VARCHAR2(50)
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TYPE ORACLE_LOADER
DEFAULT DIRECTORY data_pump_dir
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    RECORDS DELIMITED BY NEWLINE
    FIELDS TERMINATED BY '|'
    MISSING FIELD VALUES ARE NULL
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COMPANY_VN,
IL,
TERMINAL,
T_NO,
NAME,
SNAME,
REF_NO,
AMOUNT decimal ,
DATE_M CHAR date_format DATE mask "dd.mm.yyyy" ,
TIME,
TEL_NO,
ADDRESS
LOCATION ('TABLE_EXT.txt')
REJECT LIMIT 10------
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CITY HOSPITAL|04680072124|CITY|00614860|47746244218|JOHN|WHITE|172871|420,12|21.08.2011|14:26|0806422627784|06
CITY HOSPITAL|04680072124|CITY|00614847|14274017676|BRAD|BROWN|448127|810,00|22.08.2011|11:04|0806427488476|06
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