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• Create node N1.
• Create one attribute PERNR of type NUM8(NUMC -8)
• Select Input Help mode as  Object Value Selector
• Select OVS Component usage OVS_PERNR from F4 help. 

method OVS_SS .
* declare data structures for the fields to be displayed and
* for the table columns of the selection list, if necessary
  types:
    begin of lty_stru_input,
*   add fields for the display of your search input here
      field1 type string,
    end of lty_stru_input.
  types:
    begin of lty_stru_list,
*   add fields for the selection list here
      column1 type string,
    end of lty_stru_list.

  data: ls_search_input  type lty_stru_input,
        lt_select_list   type standard table of lty_stru_list,
        ls_text          type wdr_name_value,
        lt_label_texts   type wdr_name_value_list,
        lt_column_texts  type wdr_name_value_list,
        lv_window_title  type string,
        lv_group_header  type string,
        lv_table_header  type string.

  field-symbols:  type lty_stru_input,
                     type lty_stru_list.

  case ovs_callback_object->phase_indicator.

    when if_wd_ovs=>co_phase_0.  "configuration phase, may be omitted
*   in this phase you have the possibility to define the texts,
*   if you do not want to use the defaults (DDIC-texts)

      ls_text-name = `FIELD1`.  "must match a field name of search
      ls_text-value = `MYTEXT`. "wd_assist->get_text( `001` ).
      insert ls_text into table lt_label_texts.

      ls_text-name = `COLUMN1`.  "must match a field in list structure
      ls_text-value = `MYTEXT2`. "wd_assist->get_text( `002` ).
      insert ls_text into table lt_column_texts.

*      lv_window_title = wd_assist->get_text( `003` ).
*      lv_group_header = wd_assist->get_text( `004` ).
*      lv_table_header = wd_assist->get_text( `005` ).

      ovs_callback_object->set_configuration(
                label_texts  = lt_label_texts
                column_texts = lt_column_texts
                group_header = lv_group_header
                window_title = lv_window_title
                table_header = lv_table_header
                col_count    = 2
                row_count    = 20 ).


    when if_wd_ovs=>co_phase_1.  "set search structure and defaults
*   In this phase you can set the structure and default values
*   of the search structure. If this phase is omitted, the search
*   fields will not be displayed, but the selection table is
*   displayed directly.
*   Read values of the original context (not necessary, but you
*   may set these as the defaults). A reference to the context
*   element is available in the callback object.

      ovs_callback_object->context_element->get_static_attributes(
          importing static_attributes = ls_search_input ).
*     pass the values to the OVS component
      ovs_callback_object->set_input_structure(
          input = ls_search_input ).


    when if_wd_ovs=>co_phase_2.
*   If phase 1 is implemented, use the field input for the
*   selection of the table.
*   If phase 1 is omitted, use values from your own context.

      if ovs_callback_object->query_parameters is not bound.
******** TODO exception handling
      endif.
      assign ovs_callback_object->query_parameters->*
                              to .
      if not  is assigned.
******** TODO exception handling
      endif.

*     call business logic for a table of possible values
*     lt_select_list = ???

      ovs_callback_object->set_output_table( output = lt_select_list ).


    when if_wd_ovs=>co_phase_3.
*   apply result

      if ovs_callback_object->selection is not bound.
******** TODO exception handling
      endif.

      assign ovs_callback_object->selection->* to .
      if  is assigned.
*        ovs_callback_object->context_element->set_attribute(
*                               name  = `COLUMN1`
*                               value = -column1 ).
*      or
*        ovs_callback_object->context_element->set_static_attributes(
*                               static_attributes =  ).

      endif.
  endcase.

endmethod.

METHOD ovs_on_field .
  TYPES:
    BEGIN OF lty_stru_list,
*   add fields for the selection list here
          pernr TYPE pa0002-pernr,
          nachn TYPE pa0002-nachn,
          vorna TYPE pa0002-vorna,
    END OF lty_stru_list.

  DATA: lt_select_list   TYPE STANDARD TABLE OF lty_stru_list,
        ls_text          TYPE wdr_name_value,
        lt_label_texts   TYPE wdr_name_value_list,
        lt_column_texts  TYPE wdr_name_value_list.

  FIELD-SYMBOLS:     TYPE lty_stru_list.

  CASE ovs_callback_object->phase_indicator.
    WHEN if_wd_ovs=>co_phase_0.  "configuration phase, may be omitted
    WHEN if_wd_ovs=>co_phase_1.  "set search structure and defaults
    WHEN if_wd_ovs=>co_phase_2.
*   If phase 1 is implemented, use the field input for the
*   selection of the table.
*   If phase 1 is omitted, use values from your own context.
*     call business logic for a table of possible values
      SELECT pernr
             nachn
             vorna
        FROM pa0002
        INTO CORRESPONDING FIELDS OF TABLE lt_select_list
        UP TO 200 ROWS.
      ovs_callback_object->set_output_table( output = lt_select_list ).
    WHEN if_wd_ovs=>co_phase_3.
*   apply result
      ASSIGN ovs_callback_object->selection->* TO .
      IF  IS ASSIGNED.
        ovs_callback_object->context_element->set_static_attributes(
                               static_attributes =  ).
      ENDIF.
  ENDCASE.

ENDMETHOD.