How to INSERT items using BAPI_SALESORDER_CHANGE

Question

Hello all,
i am trying to insert a items into SALESDOCUMENT, i am making the following process.
i have a SALESDOCUMENT from which a make a copy then i delete all the ITEMS and i try to insert the new one, i am trying to insert a new ITEMS which has relations with another material i am making this because i am expecting when i insert the ITEMS all the material will be recalculated.
for example
position     material    quantity.
10            6050             1     this is the main material
20           7228             30    This is child record of the main material       
30           7143               1   this is child record of the main material.
when i run my function i need to modify the main material as this
  position    material    quantity
       10              6050           2.
so i am expecting
position     material    quantity.
10            6050             2     this is the main material
20           7228             60    This is child record of the main material       
30           7143               2   this is child record of the main marial.
  CALL FUNCTION 'BAPI_SALESORDER_CHANGE'
       EXPORTING
            salesdocument    = p_copia      "this is the copy
            order_header_inx = are_headx   " value U
       TABLES
            return           = tab_retor
            order_item_in    = tab_items
            order_item_inx   = tab_itemx
            schedule_lines   = tab_sched
            schedule_linesx  = tab_schex.
but i really i don`t how to do it, i have been using the bapi  BAPI_SALESORDER_CHANGE, this bapi delete the items this is ok , but  not insert the items that i need , 'does anybody has make something like this, i will really apprecite if someone give a hand, please.

Answer 1

continue..................................................
***GET LIST OF SALESORDER
CALL FUNCTION 'BAPISDORDER_GETDETAILEDLIST'
  EXPORTING
    i_bapi_view       = i_bapi_view
  TABLES
    sales_documents   = sales_documents
    order_headers_out = order_headers_out
    order_items_out   = order_items_out.
LOOP AT order_items_out .
  MOVE-CORRESPONDING order_items_out TO order_item_in.
  order_item_in-val_type = pval.
  APPEND order_item_in.
ENDLOOP.
LOOP AT order_item_in .
  MOVE-CORRESPONDING order_item_in TO itab_ch.
  APPEND itab_ch.
ENDLOOP.
LOOP AT itab_ch .
*   Header update indicator
  s_order_header_inx-updateflag = 'U'.
  i_order_item_in-itm_number = itab_ch-itm_number .
  i_order_item_in-material =   itab_ch-material.
  i_order_item_in-target_qty = itab_ch-target_qty.
  i_order_item_in-sales_unit = itab_ch-sales_unit.
  i_order_item_in-val_type = itab_ch-val_type.
  i_order_item_inx-updateflag = 'I'.
  i_order_item_inx-itm_number = itab_ch-itm_number .
  i_order_item_inx-material = itab_ch-material.
  i_order_item_inx-target_qty = 'X'.
  i_order_item_inx-sales_unit = itab_ch-sales_unit.
  i_order_item_inx-val_type =  'X'.
  APPEND: i_order_item_in, i_order_item_inx.
**  Fill schedule lines
  i_sched-itm_number = itab_ch-itm_number .
  i_sched-sched_line = '0001'.
  i_sched-req_qty    = itab_ch-target_qty.
  APPEND i_sched.
*   Fill schedule line flags
  i_schedx-itm_number  = itab_ch-itm_number .
  i_schedx-sched_line = '0001'.
  i_schedx-updateflag  = 'I'.
  i_schedx-req_qty     = 'X'.
  APPEND i_schedx.
ENDLOOP.
CALL FUNCTION 'BAPI_SALESORDER_CHANGE'
  EXPORTING
    salesdocument     = p_vbeln
    order_header_in   = s_order_header_in
    order_header_inx  = s_order_header_inx
    behave_when_error = 'P'
  TABLES
    return            = it_return
    order_item_in     = i_order_item_in
    order_item_inx    = i_order_item_inx
    schedule_lines    = i_sched
    schedule_linesx   = i_schedx.
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
  EXPORTING
    wait = 'X'.
LOOP AT it_return.
  WRITE / it_return-message.
ENDLOOP.