How to multiply fields in inside alv

Question

hi frnds,
I am Created one table having sales order input and ALV table for out put having 5 fields, material , mat description, quantity , price , amount , currency are my fields.
NOw  quantity and price are editable in alv table -
SO when i am changed the quantity and price i need to change the amount that is multiplication ,, im have save button to data base .record saving is working but i need the multi plication code.
after the multiplication i need to save in customize table.
SAVE THE DATA TO CUSTOMISE TABLE
   DATA: node_node_flighttab TYPE REF TO if_wd_context_node,
elem_node_flighttab TYPE REF TO if_wd_context_element,
itab TYPE if_FIRST_VIEW=>elements_SALE_OUTPUT.
*itab type standard table of sflight,
*wa_itab1 type sflight.
save data only if no error has occured
CHECK r_param->t_error_cells IS INITIAL.
navigate from <CONTEXT> to <NODE_FLIGHTTAB> via lead selection
node_node_flighttab
= wd_context->get_child_node( name = `SALE_OUTPUT` ).
get data from context node <NODE_FLIGHTTAB>
node_node_flighttab->get_static_attributes_table(
IMPORTING table = itab  ).
DATA: BEGIN OF itab1,
        salesorder TYPE zcustomer_order1-salesorder,
        customernum TYPE zcustomer_order1-customernum,
        purchaseorder TYPE zcustomer_order1-purchaseorder,
        matnr TYPE zcustomer_order1-matnr,
        matnrdes TYPE zcustomer_order1-matnrdes,
        qty TYPE zcustomer_order1-qty,
        zprice TYPE zcustomer_order1-zprice,
        amt TYPE zcustomer_order1-amt,
        currency TYPE zcustomer_order1-currency,
      END OF itab1.
      data : itab2 like standard table of itab1,
             wa_itab like itab1.
      data : sales type zcustomer_order1-salesorder,
            customer type zcustomer_order1-customernum,
            purchase type zcustomer_order1-purchaseorder.
      data : qty type standard table of zcustomer_order1,
             zprice type standard table of zcustomer_order1,
             amt type standard table of zcustomer_order1.
data : begin of wa_itab1,
customernum TYPE zcustomer_order1-customernum,
       purchaseorder TYPE zcustomer_order1-purchaseorder,
        matnr TYPE zcustomer_order1-matnr,
        matnrdes TYPE zcustomer_order1-matnrdes,
        qty TYPE zcustomer_order1-qty,
        zprice TYPE zcustomer_order1-zprice,
        amt TYPE zcustomer_order1-amt,
        currency TYPE zcustomer_order1-currency,
  end of wa_itab1.
  loop at itab into wa_itab1.
    move-corresponding wa_itab1 to wa_itab.
    wa_itab-salesorder = sales.
    wa_itab-customernum = customer.
    wa_itab-purchaseorder = purchase.
  insert into zcustomer_order1 values wa_itab.
     modify zcustomer_order1  from wa_itab.
        endloop.

Answer 1

thanks,
    i am having nly 4 record nly but u said to write the code in modify view, but i am having the save button to save the edited fields,
My question after i am editing the quantity and price than after clik the save button amount should change as iam edited , save held on my customize table ,
IN SAVE BUTTON THE CODE IS<
DATA: node_node_flighttab TYPE REF TO if_wd_context_node,
elem_node_flighttab TYPE REF TO if_wd_context_element,
itab TYPE if_FIRST_VIEW=>elements_SALE_OUTPUT.
*itab type standard table of sflight,
*wa_itab1 type sflight.
save data only if no error has occured
CHECK r_param->t_error_cells IS INITIAL.
navigate from <CONTEXT> to <NODE_FLIGHTTAB> via lead selection
node_node_flighttab
= wd_context->get_child_node( name = `SALE_OUTPUT` ).
get data from context node <NODE_FLIGHTTAB>
node_node_flighttab->get_static_attributes_table(
IMPORTING table = itab ).
DATA: BEGIN OF itab1,
salesorder TYPE zcustomer_order1-salesorder,
customernum TYPE zcustomer_order1-customernum,
purchaseorder TYPE zcustomer_order1-purchaseorder,
matnr TYPE zcustomer_order1-matnr,
matnrdes TYPE zcustomer_order1-matnrdes,
qty TYPE zcustomer_order1-qty,
zprice TYPE zcustomer_order1-zprice,
amt TYPE zcustomer_order1-amt,
currency TYPE zcustomer_order1-currency,
END OF itab1.
data : itab2 like standard table of itab1,
wa_itab like itab1.
data : sales type zcustomer_order1-salesorder,
customer type zcustomer_order1-customernum,
purchase type zcustomer_order1-purchaseorder.
data : qty type standard table of zcustomer_order1,
zprice type standard table of zcustomer_order1,
amt type standard table of zcustomer_order1.
data : begin of wa_itab1,
customernum TYPE zcustomer_order1-customernum,
purchaseorder TYPE zcustomer_order1-purchaseorder,
matnr TYPE zcustomer_order1-matnr,
matnrdes TYPE zcustomer_order1-matnrdes,
qty TYPE zcustomer_order1-qty,
zprice TYPE zcustomer_order1-zprice,
amt TYPE zcustomer_order1-amt,
currency TYPE zcustomer_order1-currency,
end of wa_itab1.
loop at itab into wa_itab1.
move-corresponding wa_itab1 to wa_itab.
wa_itab-salesorder = sales.
wa_itab-customernum = customer.
wa_itab-purchaseorder = purchase.
insert into zcustomer_order1 values wa_itab.
modify zcustomer_order1 from wa_itab.
iF I NEED TO PUT U R CODE IN mODIFY VIEW THAN I NEED TO DECLARE THE ITAB , WORK AREA AND ELSE NO , SO WHAT TO DO CAN TO TYPE THE CODE AS PER MY CODE.