Field synmobl code

Question

Hi Experts,
Pls see the below code:
TYPES: BEGIN OF Y_LIPS,
       VBELN  LIKE   LIPS-VBELN,
       POSNR  LIKE   LIPS-POSNR,
       MATNR  LIKE   LIPS-MATNR,
       LFIMG  LIKE   LIPS-LFIMG,
       ARKTX  LIKE   LIPS-ARKTX,
       VGBEL  LIKE   LIPS-VGBEL,
       VRKME  LIKE   LIPS-VRKME,
       VBELV  LIKE   VBFA-VBELV,
       END OF Y_LIPS.
TYPES: BEGIN OF Y_LIPS2,
       VBELN     LIKE LIPS-VBELN,
       POSNR     LIKE LIPS-POSNR,
       KUNAG     LIKE LIKP-KUNAG,
       MATNR     LIKE LIPS-MATNR,
       LFIMG     LIKE LIPS-LFIMG,
       ARKTX     LIKE LIPS-ARKTX,
       VGBEL     LIKE LIPS-VGBEL,
       WADAT_IST LIKE LIKP-WADAT_IST,
       VRKME     LIKE LIPS-VRKME,
       VBELV     LIKE VBFA-VBELV,
       END OF Y_LIPS2.
DATA:T_LIPS TYPE STANDARD TABLE OF Y_LIPS,
DATA:T_LIPS2 TYPE STANDARD TABLE OF Y_LIPS2.
FIELD-SYMBOLSl:<FS_T_LIPS> TYPE Y_LIPS,
              <FS_T_LIPS2> TYPE Y_LIPS2.
IF NOT T_LIPS IS INITIAL.
    SORT T_LIPS BY VBELN MATNR.
    UNASSIGN <FS_T_LIPS>.
    LOOP AT T_LIPS ASSIGNING <FS_T_LIPS>.
if <fs_t_lips> is assigned.
     <FS_T_LIPS2>-VBELN = <FS_T_LIPS>-VBELN.
      <FS_T_LIPS2>-MATNR = <FS_T_LIPS>-MATNR.
      <FS_T_LIPS2>-LFIMG = <FS_T_LIPS>-LFIMG.
      <FS_T_LIPS2>-ARKTX = <FS_T_LIPS>-ARKTX.
      <FS_T_LIPS2>-VGBEL = <FS_T_LIPS>-VGBEL.
      <FS_T_LIPS2>-VRKME = <FS_T_LIPS>-VRKME.
      <FS_T_LIPS2>-VRKME = <FS_T_LIPS>-VRKME.
      <FS_T_LIPS2>-VBELV = <FS_T_LIPS>-VBELV.
      COLLECT <FS_T_LIPS2> INTO T_LIPS2.
endif.
    ENDLOOP.
  ENDIF.
SO HERE THE PGM IS GOING TO DUMP AND GIVING ERROR IN DUMP LIKE:
FILED-SYMBOL  Field symbol has not yet been assigned.
THE DUMP IS AT THE STATEMENT:<FS_T_LIPS2>-VBELN = <FS_T_LIPS>-VBELN.
Can any body tell me what may be the wrong the above code.

Answer 1

Hi Ravi,
As far as i understand Field-Symbols: Unless you assign a Data Object to a field symbol you cannot use it i.e., unless a ASSIGN statement is there for a field symbol that field symbol cannot be used.
In you program: the MOVE between the field symbols is not the problem, but:
in the statement
<FS_T_LIPS2>-VBELN = <FS_T_LIPS>-VBELN.
<FS_T_LIPS2> is not yet assigned to any data object and hence is the DUMP in your program. Try assigning a data object and then do this move stmt. It works fine.
Regards,
Goutham.
This is fully based on my understanding on Field Symbols.