BAPI_SALESORDER_CHANGE - add new item ok

Hi,

i have tried to add a new item to an existing sales order and created the item 000020 for example successfully in the order that has just an item, namely 000010.

However when i created first the sales order with BAPI_SALESORDER_CREATEFROMDAT2 and specified the configuration values,it completely ok, no problem but when i created the second item, namely 000020, i was not successfull in configuration values,i want to enter customer identity number to a charactericstic but it did not do it.

But it is ok in item 000010, not ok for item 000020; what is the problem?

*configuration data for : BAPI_SALESORDER_CREATEFROMDAT2
     CLEAR: tb_order_cfgs_ref.
      tb_order_cfgs_ref-posex     = i_count."000010
      tb_order_cfgs_ref-config_id = i_cfg_id."000001
      tb_order_cfgs_ref-root_id   = '00000001'.
      APPEND tb_order_cfgs_ref.

      CLEAR: tb_order_cfgs_inst.
      tb_order_cfgs_inst-config_id  = i_cfg_id.
      tb_order_cfgs_inst-inst_id    = '00000001'.
      tb_order_cfgs_inst-obj_type   = 'MARA'.
      tb_order_cfgs_inst-class_type = '300'.
      tb_order_cfgs_inst-obj_key    = zsd_kimlik-mlzkd."st_mch1-matnr.
      APPEND tb_order_cfgs_inst.

      CLEAR: tb_order_cfgs_value.
      tb_order_cfgs_value-config_id = i_cfg_id.
      tb_order_cfgs_value-inst_id   = '00000001'.
      tb_order_cfgs_value-charc     = 'A276' .
      tb_order_cfgs_value-value     = zsd_kimlik-kmlno.
      APPEND tb_order_cfgs_value.

      CLEAR: tb_order_cfgs_refinst.
      tb_order_cfgs_refinst-posex     = i_count.
      tb_order_cfgs_refinst-config_id = i_cfg_id.
      tb_order_cfgs_refinst-inst_id   = '00000001'.
      APPEND tb_order_cfgs_refinst.

it is same for the BAPI_SALESORDER_CHANGE also.

so where i am wrong that i can not add config. data to item 000020?

Thanks.