在使用bapi BAPI_SALESORDER_CREATEFROMDAT2创建销售订单时，可以通过extensionin参数给自定义的参数赋值。
具体的使用方法可以通过点击Function module documentaion来查看，如下：
下面举例说明:
在销售订单的行项目上的additional data a tab页上有5个自定义的增强字段，如下：
对应表vbap中是如下几个字段，这些字段是通过append的方式加到vbap上的
同样，这些自定义字段也要加到structure VBAPKOZ，BAPE_VBAP和 BAPE_VBAPX中，
总结一下：
如果增强字段在销售订单抬头(vbak)上，则要将增强字段一并append到如下四个表/结构中：
- VBAKKOZ
- VBAKKOZX
- BAPE_VBAK
- BAPE_VBAKX
在行项目(vbap)上：
- VBAPKOZ
- VBAPKOZX
- BAPE_VBAP
- BAPE_VBAPX
在运货计划行(VBEP)上：
- VBEPKOZ
- BEPKOZX
- BAPE_VBEP
- BAPE_VBEPX
下面介绍如何向bapi中extensionin参数赋值数据，具体代码如下：
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DATA: lwa_bape_vbap TYPE bape_vbap. "BAPI Interface for Customer Enhancements to Table VBAP
DATA: lwa_bape_vbapx TYPE bape_vbapx. "BAPI Checkbox for Customer Enhancments to Table VBAP
DATA: lwa_extensionin TYPE bapiparex. "Customer Enhancement for VBAK, VBAP, VBEP
"Fill item level self-defined fields
* extension BAPE_VBAP
CLEAR: lwa_bape_vbap,
lwa_bape_vbapx.
* 订单号可以不填，只填行项目号就可以，然后给自定义字段赋值
lwa_bape_vbap-posnr = lwa_order_items_in-itm_number.
lwa_bape_vbap-yymv_mvgr1 = lwa_items-yymv_mvgr1.
lwa_bape_vbap-yymv_mvgr2 = lwa_items-yymv_mvgr2.
lwa_bape_vbap-yymv_mvgr3 = lwa_items-yymv_mvgr3.
lwa_bape_vbap-yymv_mvgr4 = lwa_items-yymv_mvgr4.
lwa_bape_vbap-yymv_mvgr5 = lwa_items-yymv_mvgr5.
lwa_bape_vbapx-yymv_mvgr1 = 'X'.
lwa_bape_vbapx-yymv_mvgr2 = 'X'.
lwa_bape_vbapx-yymv_mvgr3 = 'X'.
lwa_bape_vbapx-yymv_mvgr4 = 'X'.
lwa_bape_vbapx-yymv_mvgr5 = 'X'.
lwa_bape_vbapx-posnr = lwa_order_items_in-itm_number.
MOVE 'BAPE_VBAP' TO lwa_extensionin-structure.
CALL METHOD cl_abap_container_utilities=>fill_container_c
EXPORTING
im_value = lwa_bape_vbap
IMPORTING
ex_container = lwa_extensionin-valuepart1.
APPEND lwa_extensionin TO m_it_extensionin.
CLEAR lwa_extensionin.
MOVE 'BAPE_VBAPX' TO lwa_extensionin-structure.
MOVE lwa_bape_vbapx TO lwa_extensionin-valuepart1.
APPEND lwa_extensionin TO m_it_extensionin.
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最后调用bapi BAPI_SALESORDER_CREATEFROMDAT2时将上面代码中填充好的m_it_extensionin内表传入就可以了。
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CALL FUNCTION 'BAPI_SALESORDER_CREATEFROMDAT2'
EXPORTING
order_header_in = m_order_header_in
logic_switch = lwa_logic_switch
testrun = i_test_run
IMPORTING
salesdocument = m_order_number
TABLES
return = lit_return
order_items_in = m_it_order_items_in
order_partners = m_it_order_partners
order_schedules_in = m_it_order_schedules_in
order_conditions_in = m_it_order_conditions_in
order_cfgs_ref = m_it_order_cfgs_ref
order_cfgs_inst = m_it_order_cfgs_inst
order_cfgs_value = m_it_order_cfgs_value
order_cfgs_refinst = m_it_order_cfgs_refinst
order_text = m_it_order_text
extensionin = m_it_extensionin "<====自定义字段
partneraddresses = m_it_partneraddresses.
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以上。