ALV download to excel problem

Question

Dear Gurus a problem in alv report downloading to excel:
on executing the report works fine but when downloading to excel there last digit of bpvno is getting truncated.
ex: actual bpvno:'4000010' but excel o/p shows as '400001'
I have declared a field in final internal table as:
data: bpvno as bseg-belnr,
(in field catalog)
  fieldcatalog-fieldname   = 'BPVNO'.
  fieldcatalog-seltext_m   = 'BPV No.'.
  fieldcatalog-seltext_L   = 'BPV No.'.
  fieldcatalog-col_pos     = I1.
  fieldcatalog-emphasize   = 'X'.
  append fieldcatalog .
  clear  fieldcatalog.
  I1 = I1 + 1.
but after specifying the  REF_TABLENAME & REF_FIELDNAME the downloaded excel o/p is correct.
My questions is:
1) i want to know what all are mandatory fields to be specified in fieldcatalog & is it compulsory to specify REF_TABLENAME & REF_FIELDNAME .
if not complusory why the downloaded excel value is being truncated ???
plz dont send materilas on alv and answer specific to the question....

Answer 1

Hi,
I wrote a small program, and for me it worked. My assumption about the seltext was wrong. And I also didn't use output lenght.
Here is the code.
REPORT  ZALVTOEXCEL                                                 .
type-pools slis.
data : gt_fcat type slis_t_fieldcat_alv.
data fieldcatalog like line of gt_fcat.
types : begin of t_belnr,
        bpvno like bseg-belnr.
types end of   t_belnr.
data gt_belnr type table of t_belnr.
data gwa_belnr type t_belnr.
gwa_belnr-bpvno = '4000010'.
append gwa_belnr to gt_belnr.
fieldcatalog-fieldname = 'BPVNO'.
fieldcatalog-seltext_m = 'BPV No.'.
fieldcatalog-seltext_L = 'BPV No.'.
fieldcatalog-col_pos = 1.
fieldcatalog-emphasize = 'X'.
append fieldcatalog to gt_fcat.
clear fieldcatalog.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
   IT_FIELDCAT                        =  gt_fcat
    I_SAVE                            = 'A'
  TABLES
    t_outtab                          =  gt_belnr
EXCEPTIONS
   PROGRAM_ERROR                     = 1
   OTHERS                            = 2
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
regards,
Advait.