How to group data based on date

Question

In my program the internal table is returning several values based on date.
for example for the first pernr in the image below  there are four records. i need to delete the first record which is between the dates 20 and 30 .
and also i need to get the difference between the dates as the record 23 and 28  i need to get separate dates as 24, 25..28.

Answer 1

I am not sure if I understood your question correctly.
From what I have understood, you can use the following logic.
This logic will move all the records from lt_fields2 to another table lt_fields1 with begda between 20 and 30 of any month, except for the first record. It will also move records for every date between begda and endda of each record.
You can alter the logic based on your exact requirement.
declare another table lt_fields1 like lt_fields2.
data del_flag.
data prev_month(2) type c.
sort lt_fields by pernr begda.
clear del_flag.
loop at lt_fields2 into wa_fields where begda+6(2) GE 20.
* Delete the first record having date greater than 20 in a month for each pernr.
   at new pernr.
        clear del_flag.
   endat.
   if begda+4(2) NE prev_month.
       clear del_flag.
  endif.         
    if del_flag is initial. 
        del_flag = 'X'.
        continue.  " This record will not be moved to the final internal table.
   endif.
* Add records for each date between begda and endda.
   append wa_fields to lt_fields1.
   prev_month = begda+4(2)
   while wa_fields-begda LT wa_fields-endda.
         wa_fields-begda = wa_fields-begda+1.
         append wa_fields to lt_fields1.
   endwhile.
endloop.