How to get the text in module pool program after f4 help

Hi to all experts,
My required is to get the text of a field when the user clicks on the f4 help text should be populated automatically beside the field
how to do it

>
> the screen name is defined as t528t-plstx and while passing im using the same name in the POV module after what could be the reason;
Hi in the POV module, first read the dynpro filed for which a text has to be displayed  (using FM- DYNP_VALUES_READ)and then update your Text Description field uing  the FM -'DYNP_VALUES_UPDATE
    dynpfields-fieldname  = 'FNAME'.                  "FNAME is the field for which POV is called
    append dynpfields.
    repid = sy-repid.
  call function 'DYNP_VALUES_READ'
       exporting
            dyname     = sy-cprog
            dynumb     = sy-dynnr
       tables
            dynpfields = dynpfields
       exceptions
            others.
   read table dynpfields index 1.
   fname = dynpfields-fieldvalue.
*Fetxh the Text field into a local varaible.
    l_plstx = XXXXXXX. 
    dynpfields-fieldname    = 'T528T-PLSTX'.
    dynpfields-fieldvalue   =  l_plstx.
    APPEND dynpfields .
    CALL FUNCTION 'DYNP_VALUES_UPDATE'
      EXPORTING
        dyname               = sy-repid
        dynumb               = sy-dynnr
      TABLES
        dynpfields           =  dynpfields.
This will update your text field dynamically.
Regards,
Rajesh

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