Even though am using Field-Symbol correctly, showing error!!!

Question

Hello
Below is my code,
LOOP AT itab_data INTO <fs_data>.
   CHECK <fs_data>-error_flag = 'X'.
   READ TABLE itab_docnum INTO <fs_docnum>
    WITH KEY docnum = <fs_data>+4(16)
    BINARY SEARCH.
LOOP AT itab_data INTO <fs_data>.
   CHECK <fs_data>+1(10) <> 'END_REC'(025) AND
         <fs_data>+1(10) <> 'BEGIN_REC'(026).
     ASSIGN <fs_data>+1(*) TO <fs_edid2> CASTING.
     <fs_data> = <fs_edid2>.
   MOVE-CORRESPONDING <fs_data> TO w_edi_dd.
   <fs_data>+1    = w_edi_dd.
But, am getting the below error message in SLIN/Extended Prog Check.
Fieldsymbol <FS_DATA> is not assigned to a field
(The message can be hidden with "#EC *)
1) I do not understand why am getting this (if itab contains any data then ONLY the loop will be executed right?)
2) How to correct this?
Thank you

Answer 1

Hello,
Correct method of using a field-symbol is to assign it first with the structure.
You use INTO if working with work area. Example:
LOOP AT itab_data INTO w_data.
Use assigning keyword when using field-symbol in case of LOOP...ENDLOOP.
LOOP AT itab_data ASSIGNING <fs_data>.
Check below link on 'Assigning Data Objects to Field Symbols':
http://help.sap.com/SAPhelp_nw04/helpdata/en/fc/eb3860358411d1829f0000e829fbfe/frameset.htm
Hope it helps!
Regards,
Saba
Edited by: Saba Sayed on Feb 27, 2011 11:35 PM