How to update the value inside a field symbol ?

ASSIGN COMPONENT 'MENGE' OF STRUCTURE <fs_line> TO <fs_field>.
<fs_field> = itab_stpo-menge.
COLLECT <fs_line> INTO <fs_table>.
.processing some code......
ASSIGN COMPONENT 'MENGE' OF STRUCTURE <fs_line> TO <fs_field>.
<fs_field> = ( itab_stpo-menge * itab_plpo-vgw03 ).
COLLECT <fs_line> INTO <fs_table>.
Hi, guys,
May i know is there a way to update the value in inside a field symbol?
I feel hard to figure out the way to solve this situation. Kindly give me some help or perhaos tell me other altenative way to do it also can.
Thanks in advance.
Edited by: Jiansi Lim on Apr 25, 2008 8:09 PM

hi check this...
For a structured data object s, you can use the statement
ASSIGN COMPONENT comp OF STRUCTURE s TO FS.
Here the comp is the component name or its index number in the structure.
Find the following sample code -
DATA: BEGIN OF LINE,
COL1 TYPE I VALUE '11',
COL2 TYPE I VALUE '22',
COL3 TYPE I VALUE '33',
END OF LINE.
DATA COMP(5) VALUE 'COL3'.
FIELD-SYMBOLS: <F1>, <F2>, <F3>.
ASSIGN LINE TO <F1>.
ASSIGN COMP TO <F2>.
DO 3 TIMES.
ASSIGN COMPONENT SY-INDEX OF STRUCTURE <F1> TO <F3>.
WRITE <F3>.
ENDDO.
ASSIGN COMPONENT <F2> OF STRUCTURE <F1> TO <F3>.
WRITE / <F3>.
The output is:
11 22 33
33
I need to update one field in Internal table
regards,
venkat

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