DTP filter routine is not working

Question

Dear gurus
I am working with BI 7  and I have created following filter'routine in the DTP.
But the routine is not filtering.
The statement :  read table l_t_range with key
                           fieldname = 'CLEAR_DATE'.
is not working. sy-tabix = 0
Fieldname is really CLEAR_DATE
Please can you tell me what is wrong in the routine
data: l_idx       like sy-tabix,
        w_date      like sy-datum,
        w_date_low  like sy-datum,
        w_date_high like sy-datum.
  read table l_t_range with key
       fieldname = 'CLEAR_DATE'.
  l_idx = sy-tabix.
w_date = '20090705'.*
  w_date = sy-datum.
    w_date+6(2) = '01'.
    w_date_high = w_date - 1.
    w_date_low  = w_date_high.
    w_date_low+6(2) = '01'.
    l_t_range-low  = w_date_low.
    l_t_range-high = w_date_high.
    l_t_range-sign = 'I'.
    l_t_range-option = 'BT'.
    modify l_t_range index l_idx.
  p_subrc = 0.
Edited by: Firmin Kouassi on Nov 3, 2009 12:04 PM
Edited by: Firmin Kouassi on Nov 3, 2009 12:05 PM

Answer 1

Try adding the following:
l_t_range-fieldname = 'CLEAR_DATE'.
to your code:
l_t_range-low = w_date_low.
l_t_range-high = w_date_high.
l_t_range-sign = 'I'.
l_t_range-option = 'BT'.
And at the end append/modify like this:
if l_idx NE 0.
    modify l_t_range index l_idx.
  else.
    append l_t_range.
  endif.
  p_subrc = 0.