Update non-editable field Start date which is calculated from other context

Question

I had created some custom date fields(model, bol entity) in component ICCMP_BTSHEAD. We are calculating Start date based on the new input value into receiving date in the other context node.
so, for this i get the value on controller class(_IMPL). and pass the same value in the GET method of Start date.
But, Problem is Start date is the non-editable field so SET method will not be trigger as expected. so the same i used the DO_PREPARE_OUTPUT method but it's called and update the value when we press the enter. IF directly we click on the "SAVE" button then it' trigger but value is not updating in the database.
Please, find the below piece of code for the same. can u please anybody help me that how can i achieve this requirement.
DATA: l_recieve_date     TYPE crmt_date_timestamp_from,
        lr_current TYPE REF TO cl_bsp_wd_mixed_node,
        lr_col      TYPE REF TO cl_bsp_wd_collection_wrapper.
  DATA: lv_date TYPE d,
         lv_time TYPE t,
         lv_date_temp TYPE sydatum.
  IF iv_first_time EQ abap_false. "avoid for first tile load
Read the value of btreceivedate-TIMESTAMP_FROM.
    lr_col = me->ztyped_context->btreceivedate->get_collection_wrapper( ).
    IF lr_col IS BOUND.
      lr_current ?= lr_col->get_current( ).
      IF lr_current IS BOUND.
        lr_current->if_bol_bo_property_access~get_property_as_value( EXPORTING iv_attr_name = 'TIMESTAMP_FROM'
                                   IMPORTING ev_result   = l_recieve_date ).
      ENDIF.
    ENDIF.
    IF l_recieve_date IS NOT INITIAL.
      CONVERT TIME STAMP l_recieve_date TIME ZONE sy-zonlo
                INTO DATE lv_date TIME lv_time.
Check day is working day - if not, correct to previous working day
      IF lv_date IS NOT INITIAL.
        lv_date_temp = lv_date.
        CALL FUNCTION 'DATE_CONVERT_TO_FACTORYDATE'
          EXPORTING
            correct_option      = '-'
            date                = lv_date
            factory_calendar_id = 'GB'
          IMPORTING
            date                = lv_date_temp
          EXCEPTIONS
            date_after_range    = 1
            date_before_range   = 2.
        IF sy-subrc IS INITIAL.
          lv_date = lv_date_temp.
        ENDIF.
      ENDIF.
      CONVERT DATE lv_date TIME lv_time
             INTO TIME STAMP l_recieve_date TIME ZONE sy-zonlo.
    ENDIF.
    lr_col = me->ztyped_context->btstart->get_collection_wrapper( ).
    IF lr_col IS BOUND.
      lr_current ?= lr_col->get_current( ).
      IF lr_current IS BOUND.
        lr_current->if_bol_bo_property_access~set_property(
                   iv_attr_name = 'APPT_TYPE'               "#EC NOTEXT
                   iv_value     = 'ZSTWTIME0001' ).
        lr_current->if_bol_bo_property_access~set_property(
                        iv_attr_name = 'TIMESTAMP_FROM'     "#EC NOTEXT
                        iv_value     = l_recieve_date ).
      ENDIF.
    ENDIF.
  ENDIF.
could you please help me?

Answer 1

Hi,
Thanks for your reply,
yes, i checked the same thing also. But DO_HANDLE_DATA is called before the SET method of receiving date and in that case we are getting the old value in DO_HANDLE _DATA and  source and Target fields both are not updating.
I checked, if, i'll change the input field then set method of input field and then EH_ON_SAVE is called directly.
i think, if i'll do the same modification in the EH_ON_SAVE method as i did in the DO_PREPARE_OUTPUT then it can be updated but i don't want to change the EH_ON_SAVE at this moment.
is there any other way to update the START DATE(Display mode in the screen) which is calculate from the other context node field receiving date.