ls_order_item-itm_number = '40'.
  append ls_order_item to lt_order_item.

  ls_order_itemx-itm_number = '40'.
  ls_order_itemx-updateflag = 'U'.
  append ls_order_itemx to lt_order_itemx.


  ls_order_cond-itm_number = '20'.
  ls_order_cond-cond_st_no = '22'.
  ls_order_cond-cond_count = '1'.
  ls_order_cond-cond_type  = 'ZPR0'.
  ls_order_cond-cond_value = '1150'.
  ls_order_cond-currency   = 'EUR'.
  append ls_order_cond to lt_order_cond.

  ls_order_condx-itm_number   = '20'.
  ls_order_condx-cond_st_no   = '22'.
  ls_order_condx-cond_count   = '1'.
  ls_order_condx-cond_type    = 'ZPRO'.
  ls_order_condx-updateflag   = 'U'.
  ls_order_condx-cond_value   = 'X'.
  ls_order_condx-currency     = 'X'.
  append ls_order_condx to lt_order_condx.



  ls_order_header_in-sales_org  = '0100'.  " vkorg
  ls_order_header_in-distr_chan = '22'.    " vtweg
  ls_order_header_in-division   = '00'.     " spart
  ls_order_header_in-sales_grp  = '146'.   " vkgrp
  ls_order_header_in-sales_off  = '0100'.  " vkbur

  ls_order_header_inx-updateflag = 'U'.


  call function 'BAPI_SALESORDER_CHANGE'
    exporting
      salesdocument    = '0000050553'
      order_header_in  = ls_order_header_in
      order_header_inx = ls_order_header_inx
    tables
      return           = lt_return
      order_item_in    = lt_order_item
      order_item_inx   = lt_order_itemx
      conditions_in    = lt_order_cond
      conditions_inx   = lt_order_condx.

ls_order_item-itm_number = '40'.
<...> 
  ls_order_cond-itm_number = '20'.

  ls_order_header_in-sales_org  = '0100'.  " vkorg
  ls_order_header_in-distr_chan = '22'.    " vtweg
  ls_order_header_in-division   = '00'.     " spart
  ls_order_header_in-sales_grp  = '146'.   " vkgrp
  ls_order_header_in-sales_off  = '0100'.  " vkbur

  ls_order_header_inx-updateflag = 'U'.