Preface – This post is part of the SAP ABAP OData Tutorial series.

Context

Create entity can be implemented in two ways:

1. Using CREATE_ENTITY method for single entity creation.
2. Using CREATE_DEEP_ENTITY method to create a single entity as well as parent and child entity together.

Procedure

1. Open *DPC_EXT class artifact of OData and redefine *CREATE_ENTITY method.

2. Reimplement the method.

method PARTNERS_CREATE_ENTITY.
  data: lv_id                type          snwd_partner_id,
        ls_id                type          bapi_epm_bp_id,
        ls_header            type          bapi_epm_bp_header,
        lt_return            type 	      table of bapiret2,
        error_msg            type          string,
        ls_message           type          scx_t100key,
        lt_keys              type          /iwbep/t_mgw_tech_pairs,
        ls_snwd_bpa          type          snwd_bpa,
        lv_timestamp         type          timestamp.
  io_data_provider->read_entry_data( importing es_data = ls_header ).
  CALL FUNCTION 'BAPI_EPM_BP_CREATE'
    EXPORTING
      HEADERDATA        = ls_header " EPM: BP header data
    IMPORTING
      BUSINESSPARTNERID = ls_id
    TABLES
      RETURN     = lt_return.     
  if lt_return is not initial.
    loop at lt_return reference into data(lr_return).
      err_msg = lr_return->message .
    endloop.
    ls_message-msgid = 'SY'.
    ls_message-msgno = '002'.
    ls_message-attr1 = error_msg.
    raise exception type /iwbep/cx_mgw_busi_exception
      EXPORTING
        textid = ls_message.
  endif.
  CALL FUNCTION 'BAPI_EPM_BP_GET_DETAIL'
    EXPORTING
      BP_ID             = ls_id
    IMPORTING
      HEADERDATA        = er_entity
endmethod. 

The input data is passed in es_data structure and captured in ls_header. The structure ls_header is then used as the input parameter of BAPI ‘BAPI_EPM_BP_CREATE’ to create data in the database. Then BAPI ‘BAPI_EPM_BP_GET_DETAIL’ will retrieve the created data and capture it in er_entity which will be passed to the response body.

3. Activate the class.

4. Create Deep Entity (To create Header with Item): Redefine method /IWBEP/IF_MGW_APPL_SRV_RUNTIME~CREATE_DEEP_ENTITY

5. Reimplement the method.

method /IWBEP/IF_MGW_APPL_SRV_RUNTIME~CREATE_DEEP_ENTITY.
 types: ty_t_soitem type standard table of  zcl_z_epm_rkt_mpc=>ts_salesorderitem with default key.
 types: begin of ty_s_so.
          include type zcl_z_epm_rkt_mpc=>ts_salesorder.
           types: items type ty_t_soitem,
         end of ty_s_so.
  data: ls_sales_order     type ty_s_so,
        lv_compare_result  type /iwbep/if_mgw_odata_expand=>ty_e_compare_result.
  data: lv_so_id    type BAPI_EPM_SO_ID,
        ls_so_hdr    type BAPI_EPM_SO_HEADER,
        ls_so_hdr2   type BAPI_EPM_SO_HEADER,
        ls_so_item   type BAPI_EPM_SO_ITEM,
        lt_so_item   type standard table of BAPI_EPM_SO_ITEM,
        lt_so_item2  type standard table of BAPI_EPM_SO_ITEM,
        lt_return   type bapirettab,
        ls_return   TYPE bapiret2,
        ls_message  type scx_t100key,
        error_msg     type string.
  constants: lc_so_itm TYPE string VALUE 'Items'.
* Validate whether data matches
  lv_compare_result = io_expand->compare_to( lc_so_itm ).
* Access data from IO_DATA_PROVIDER
  if lv_compare_result EQ /iwbep/if_mgw_odata_expand=>gcs_compare_result-match_equals.
io_data_provider->read_entry_data( IMPORTING es_data = ls_sales_order ).
*   Move header Sales order data into BAPI structure
    move-corresponding ls_sales_order to ls_so_hdr.
*   Move Sales Order items into BAPI table structure
    loop at ls_sales_order-items into ls_so_item.
       append ls_so_item to lt_so_item.
    endloop.
    CALL FUNCTION 'BAPI_EPM_SO_CREATE'
      EXPORTING
        HEADERDATA          = ls_so_hdr
      IMPORTING
        SALESORDERID        = lv_so_id
      TABLES
        ITEMDATA            = lt_so_item
        RETURN              = lt_return.
    if lt_return is not initial.
      loop at lt_return into ls_return.
        err_msg = ls_return-message .
      endloop.
      ls_message-msgid = 'SY'.
      ls_message-msgno = '002'.
      ls_message-attr1 = error_msg.
      raise exception type /iwbep/cx_mgw_busi_exception
        exporting
          textid = ls_message.
    else.
      CALL FUNCTION 'BAPI_EPM_SO_GET_DETAIL'
        EXPORTING
          SO_ID            = lv_so_id
        IMPORTING
          HEADERDATA       = ls_so_hdr2
        TABLES
          ITEMDATA         = lt_so_item2.
      move-corresponding ls_so_hdr2 to ls_sales_order.
      ls_sales_order-items = lt_so_item2.
      copy_data_to_ref(
      EXPORTING
        is_data = ls_sales_order
      CHANGING
        cr_data = er_deep_entity ).
    endif.
  endif.
endmethod. 

The structure of incoming data contains parent and child entity nested structure. This is defined with type ty_s_so.

6. Activate the class

7. Execute the Create request.

• Select Entity Set
• Select HTTP method as POST
• Add the data in the request body
• Click Execute