Method EXECUTE

				METHOD /bobf/if_frw_determination~execute.    DATA lt_item_data  TYPE        zci_t_item.    DATA lr_item_data  TYPE REF TO zci_s_item.* For the customer invoice retrieve its ITEM nodes     io_read->retrieve(      EXPORTING        iv_node = zif_ci_customer_invoice_c=>sc_node-item        it_key  = it_key      IMPORTING        et_data = lt_item_data ).* Calculate the amount (= price x quantity) for each item      LOOP AT lt_item_data REFERENCE INTO lr_item_data.      lr_item_data->amount = lr_item_data->price * lr_item_data->quantity.      * Update the customer invoice with calculated amount      io_modify->update(        EXPORTING          iv_node = zif_ci_customer_invoice_c=>sc_node-item          iv_key  = lr_item_data->key          is_data = lr_item_data ).    ENDLOOP.ENDMETHOD.