Can't initialise dialog screen fields with values

Hi.
I have a dialog screen with 10 fields named
TXT_FILEDESC1, TXT_FILEDESC2, ...TXT_FILEDESC10.
I tried to initialise these 10 fields with the following codes, but I got an error message:
DATA: TXT_FILENAME TYPE ZDM_OF-FILE_NAME,
      TXT_FILEDESC TYPE ZDM_OF-FILE_DESC.
FIELD-SYMBOLS: <FS_TXT_FILENAME>, <FS_TXT_FILEDESC>.
MODULE PBO_9000 OUTPUT.
SET PF-STATUS 'STATUS_9000'.
SELECT FILE_NAME FILE_DESC FROM ZSCSDM_OF INTO TABLE SCREEN_INIT.
LOOP AT SCREEN_INIT INTO SCREEN_INIT_LINE.
    SCREEN_INIT_NO = SY-TABIX.
    CONCATENATE 'TXT_FILEDESC' SCREEN_INIT_NO INTO TXT_FILEDESC.
    ASSIGN (TXT_FILEDESC) TO <FS_TXT_FILEDESC>.
    MESSAGE E002(ZMSGGARY) WITH TXT_FILENAME.
    <FS_TXT_FILEDESC> = SCREEN_INIT_FILEDESC.
    ENDLOOP.
ENDMODULE.                    "PBO_9000 OUTPUT
Runtime Error - A new value is to be assigned to the field "<FS_TXT_FIELDDESC>", although this field is entirely or partly protected against changes...
Could anyone share why I got the above error message when i try to run the program (Execute --> In A New Window)? Thanks.
null

I got the reason for the error. It's because I did not clear the contents of TXT_FILENAME before the next loop.
LOOP AT SCREEN_INIT INTO SCREEN_INIT_LINE.
<b>TXT_FILENAME = ''. ==> This solves the problem.</b>
CONCATENATE 'TXT_FILEDESC' SCREEN_INIT_NO INTO TXT_FILEDESC.
ENDMODULE. "PBO_9000 OUTPUT

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TimB83 wrote:
I have a table with many rows. The attributes of the table are code, month and value.
For each code there are 12 months and 12 values.
No I want to add the gaps between the months...
Is it possible to count the following gaps between the different rows...?
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june value = 0
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agust value = 20
september value = 0 (=>count this gap => new value 1 )
october value = 10
november value = 0
december value = 0 (=>count this two following gaps => new value 2 )
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1,1,20
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1,3,30
1,4,*1*
1,5,40
1,6,0
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1,8,20
1,9,*1*
1,10,10
1,11,0
1,12,*2*
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5,2,20
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select 1 as code, 2 as month, 0 as value from dual union all
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select 1 as code, 12 as month, 0 as value from dual union all
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