SAP ABAP : Attach a Search Help to the Screen Field

I have a requirement to attach a search help to the screen field. When I click on the drop-down list, it should automatically pick the company code that is already displayed on the screen and show the results.
 
It dosent make any sense for search help to wait for user to input the same company code which is already displayed.

Use this functionality to get help.

FORM HELP_CHECK.



*-- Set up fields to retrieve data

  ltab_fields-tabname    = 'ZFI_PMNTADV'.
  ltab_fields-fieldname  = 'CHECT'.
  ltab_fields-selectflag = 'X'.
  APPEND ltab_fields.

  ltab_fields-tabname    = 'ZFI_PMNTADV'.
  ltab_fields-fieldname  = 'PMNT_ADV'.
  ltab_fields-selectflag = 'X'.
  APPEND ltab_fields.

  SORT ltab_fields.
  DELETE ADJACENT DUPLICATES FROM ltab_fields.

*-- Fill values
  SELECT chect
  INTO TABLE ltab_values
         FROM zfi_pmntadv
            WHERE pmnt_adv NE space.
  SORT ltab_values.
  DELETE ADJACENT DUPLICATES FROM ltab_values.

CALL FUNCTION 'HELP_VALUES_GET_WITH_TABLE'
     EXPORTING
          fieldname                 = 'chect'
          tabname                   = 'zfi_pmntadv'
          title_in_values_list      = 'Select a value'
     IMPORTING
          select_value              = so_chect
     TABLES
          fields                    = ltab_fields
          valuetab                  = ltab_values
     EXCEPTIONS
          field_not_in_ddic         = 01
          more_then_one_selectfield = 02
          no_selectfield            = 03.
 

ENDFORM.                    "fiscal_year

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