There are totally 60 function modules in One order with naming convention CRM_<Object>_FILL_OW:
They are NOT used in read scenario but in modify scenario. For example once you change the Closing Date of a given opportunity in WebUI ( from 2017-02-15 to 2017-02-16 )
The function module for Opportunity header extension, CRM_ORDERADM_H_FILL_OW, is called with the following callstack:
As its name FILL_OW indicates, it is responsible to FILL the latest input by consumer into so called object work area( OW ) for later use.
In order to make the research life easier I write the following report to trigger this FILL_OW function module call from backend:
REPORT zoneorder_modify. CONSTANTS: gv_guid TYPE crmt_object_guid VALUE '6C0B84B759DF1ED6BDF05763B3DC8841'. DATA: lt_opport_h TYPE crmt_opport_h_comt, ls_opport_h LIKE LINE OF lt_opport_h, lt_change TYPE crmt_input_field_tab, ls_change LIKE LINE OF lt_change. ls_opport_h-ref_guid = gv_guid. ls_opport_h-expect_end = '20170216'. ls_change = VALUE #( ref_guid = gv_guid ref_kind = 'A' objectname = 'OPPORT_H' ). APPEND 'EXPECT_END' TO ls_change-field_names. APPEND ls_change TO lt_change. APPEND ls_opport_h TO lt_opport_h. CALL FUNCTION 'CRM_ORDER_MAINTAIN' EXPORTING it_opport_h = lt_opport_h CHANGING ct_input_fields = lt_change EXCEPTIONS error_occurred = 1 document_locked = 2 no_change_allowed = 3 no_authority = 4. WRITE: / sy-subrc.
It’s very clear now the logic of this FILL_OW consists of four main parts:
1. field check done in FM CRM_OPPORT_H_FIELDCHECK_FC
This check function module further calls two function modules:
This check could be switched off by function module CRM_ORDER_SET_ACTIVE_OW.
A customer exit if_ex_crm_order_fieldcheck and a new BAdI definition crm_order_fieldcheck_new is allowed for customer to implement their own check logic and called within this check function module.
This FM will call dedicated check function module for a given field registered in system table CRMC_FIELDCHECK:
The logic of this FM is already explained in blog: Buffer logic in One Order header extension Read.
This FM is responsible to move the latest value entered by consumer ( is_opport_h_com in line 65 ) to object work area ( postfix WRK in variable ls_opport_h_wrk in line 68 ). You can observe in the debugger that before this FM is executed, object work area still contains the old value 2017-02-15 read from FM CRM_OPPORT_H_READ_OB in step 2.
Inside this FM there is a check to avoid the field is being changed unnecessarily ( specified new value = old value ) or by mistake ( the field validation fails ).
This is a screenshot how ls_opport_h_wrk looks like after this third step is executed:
Opportunity header extension specific fields are filled in this FM.
The following fields are populated in this FM with related business logic.
Once all these four steps are done successfully, CRM_OPPORT_H_FILL_OW has now generated a consistent object work area and stored in ls_opport_h_wrk.
This object work area will be put to object buffer for later save usage via FM CRM_OPPORT_H_PUT_OB.
I have written a series of blogs to explain how One Order API works. The blogs are written based on a simple scenario: read, change and save field “Closing Date” in Opportunity header level.