Sum in internal table issue

Question

Dear Experts,
I have a Qty field which needs to be summed up when material no, po no and size are same in my internal table
Eg: PO no     Mat no     Size      Qty
      111          001          L          10
      111          001          L          20
needs to be shown as
      111          001          L          30
I have tried using the collect statement in several ways but unfortunately ddnt work out. Any suggestions?

Answer 1

Although Farid's sugegestion of looping and over two tables and summing would work I don't there is any reason to desist with your original approach of using the collect statement. The collect statment is designed exactly for this purpose and would be more efficient than two nested loops. As described before the folloiwng code should work the correct data elements inserted instead of the descriptions
types: BEGIN OF tys_structure,
         po_num type po_num,
         mat_no type mat_no,
         size type sizw,
         qty type qty,
        END OF tys_structure.
data: lt_table type standard table of tys_structure
           with non-unique key matnr, po_no, size,
         ls_workarea type type_structure.
collect ls_workarea into lt_table.
One additional note, It would probably be better to use a unique key of a sorted or hashed table if you only want the results to be aggreagted by material no, po no and size. I suggested a non-unique key of a standard table here because it is more flexible and i don't know what elese you might want to do with this table in your code.