To do so you first need to ensure that the following 5 tables are in synch.
1) VBAP: In your append structure you specify your ZZFIELD with the data type as needed
2) BAPE_VBAP: In the append structure here also add the ZZFIELD with the data type as needed with limitations. No decimals. Try and stick to char characters
3) BAPE_VBAPX: In the append structure add the field ZZFIELD of type BAPIUPDATE
(NOTE: (2) and (3) must have the same number of fields in the same order)
4) VBAPKOZ: In the append structure here also add the ZZFIELD with the data type as needed with limitations. No decimals. Try and stick to char characters
5) VBAPKOZX: In the append structure add the field ZZFIELD of type BAPIUPDATE
(NOTE: (4) and (5) must have the same number of fields in the same order)
(Note: A great tip from Hendrik Maas: Use Data element CHAR1 instead of BAPIUPDATE as it will not work for BAPI_SALESDOCUMENT_CHANGE)
Similarly do for VBAK, BAPE_VBAK, BAPE_VBAKX, VBAKKOZ and VBAKKOZX.
Next we get to the code to fill in the structure EXTENSIONIN
I will demonstrate how to call the create sales order BAPI with custom fields.
* Local definitions
DATA: wa_extensionin TYPE bapiparex,
wa_bape_vbap TYPE bape_vbap,
wa_bape_vbapx TYPE bape_vbapx,
wa_bape_vbak TYPE bape_vbak,
wa_bape_vbakx TYPE bape_vbakx,
lv_posnr TYPE posnr.
* Processing the header extension
CLEAR wa_bape_vbak.
wa_bape_vbak-ZZFIELD = 'HDRTEST'.
wa_extensionin-structure = 'BAPE_VBAK'.
wa_extensionin+30(960) = wa_bape_vbak.
append wa_extensionin to lt_extensionin.
clear wa_extensionin.
* Processing the line extension
LOOP AT line_items INTO wa_lineitems.
ADD 10 TO lv_posnr.
CLEAR wa_bape_vbap.
wa_bape_vbap-ZZFIELD = 'TEST'.
wa_extensionin-structure = 'BAPE_VBAP'.
wa_bape_vbap-posnr = lv_posnr.
wa_extensionin+30(960) = wa_bape_vbap.
append wa_extensionin to lt_extensionin.
clear wa_extensionin.
CLEAR wa_bape_vbapx.
wa_bape_vbapx-ZZFIELD = 'X'.
wa_extensionin-structure = 'BAPE_VBAPX'.
wa_bape_vbapx-posnr = lv_posnr.
wa_extensionin+30(960) = wa_bape_vbapx.
append wa_extensionin to lt_extensionin.
clear wa_extensionin.
ENDLOOP.
* Then the call to the BAPI
CALL FUNCTION 'BAPI_SALESORDER_CREATEFROMDAT2'
EXPORTING
order_header_in = ls_order_header_in
order_header_inx = ls_order_header_inx
IMPORTING
salesdocument = lv_salesdocument
TABLES
return = lt_ret2
order_items_in = lt_order_items_in
order_items_inx = lt_order_items_inx
order_partners = lt_order_partners
order_keys = lt_order_keys
extensionin = lt_extensionin.
Note: If you have a need to force a different Business Object type or wish to see the extension return fields then use the function SD_SALESDOCUMENT_CREATE instead.
CALL FUNCTION 'SD_SALESDOCUMENT_CREATE'
EXPORTING
sales_header_in = ls_order_header_in
sales_header_inx = ls_order_header_inx
business_object = 'BUS2032'
IMPORTING
salesdocument_ex = lv_salesdocument
sales_header_out = lv_sales_header_out
sales_header_status = lv_sales_header_status
TABLES
return = lt_ret2
sales_items_in = lt_order_items_in
sales_items_inx = lt_order_items_inx
sales_partners = lt_order_partners
sales_keys = lt_order_keys
extensionin = lt_extensionin
incomplete_log = lt_incomplete_log
extensionex = lt_extensionex.
