You can do this by two way:

1. Make a help by using SE11 & attach it to your field like this 'parameters abc like zstudent-name matchcode object id = search help name'
&
2. Use Function module to make help on your field by using this coding.
********************************************************************************

DATA: lc_vbeln      LIKE vbrk-vbeln,
      ltab_fields LIKE help_value OCCURS 0 WITH HEADER LINE,

      BEGIN OF ltab_values OCCURS 0,
        feld(40) TYPE c,
      END OF ltab_values.

**&--------------------------------------------------------------------*
**&      Form  HELP_CHECK
**&--------------------------------------------------------------------*
**       text
**---------------------------------------------------------------------*
FORM help_check.
*-- Set up fields to retrieve data

  ltab_fields-tabname    = 'VBRK'.
  ltab_fields-fieldname  = 'VBELN'.
  ltab_fields-selectflag = 'X'.
  APPEND ltab_fields.

  ltab_fields-tabname    = 'VBRK'.
  ltab_fields-fieldname  = 'FKDAT'.
  ltab_fields-selectflag = space.
  APPEND ltab_fields.

*-- Fill values
  SELECT * FROM vbrk WHERE kunag = 'RICO0US'.
    ltab_values-feld = vbrk-vbeln.
    APPEND ltab_values.
    ltab_values-feld = vbrk-fkdat.
    APPEND ltab_values.
  ENDSELECT.

  CALL FUNCTION 'HELP_VALUES_GET_WITH_TABLE'
    EXPORTING
      fieldname                 = 'VBELN'
      tabname                   = 'VBRK'
      title_in_values_list      = 'Select a value'
    IMPORTING
      select_value              = pr_vbeln
    TABLES
      fields                    = ltab_fields
      valuetab                  = ltab_values
    EXCEPTIONS
      field_not_in_ddic         = 01
      more_then_one_selectfield = 02
      no_selectfield            = 03.
ENDFORM.                    "fiscal_year

************************************************************************
End of Coding
************************************************************************

Tips by: Anil

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