Compute total on a field based on change in values in 2 other fields

Question

I have the following requirement
ITAB has fields 
PO#     PO_LINE# ............  PRICE
100              1                          500
100               2                         100
200               1                          300
300               1                         200
300               2                         700
300               3                         100
and my required output in ALV is
PO#     PO_LINE# ............  PRICE
100              1                          500
100               2                         100
                                 Total        600
200               1                          300
                                 Total        300
300               1                         200
300               2                         700
300               3                         100
                                  Total      1000
i want to compute the total price for each PO#.
Can someone please suggest how ?
Thank u so much.

Answer 1

Hello Asha,
It appears that you are looking for the subtotal functionality that is built into ALV. The "sort" table that is accepted by the ALV FM has a field named "subtot" that can be used to flag a field for subtotals. In your case you would flag the PO# field for subtotals.
A bare bones example of entering this information can be seen in the following:
" Fill out the field catalog, layout, etc.
" Now we will populate the sort information
ls_sort-fieldname = 'PONUMBER'.
ls_sort-up = 'X'.
ls_sort-subtot = 'X'. "This is the field that will allow subtotals
APPEND ls_sort TO gt_sort.
" Call the the display ALV FM
Now this comes with a number of conditions:
1. For simple cases, the field you want to subtotal over must be the left-most column. In your example it looks like you meet this requirement as PO# is the first column.
2. You also need to make sure that there is a column that allows totals. In your example you need to make sure price has the proper data type to allow for totals.
If you are still having trouble, I would recommend looking at the following code example: [Display subtotal text in ALV grid|http://wiki.sdn.sap.com/wiki/display/Snippets/DisplaysubtotaltextinALV+grid]. It contains a more complete example of how to use subtotals in ALV.