Data elements used in Z Program

Hi  All,
I have to create a Z Program which has the Program name as input (Selection Screen) and i need to display the data elements (and details ex: data type , length) used in the program .
Can anyone help me out ..
Thanks,
Pradeep.

Enjoy
Had a very tough time debugging the standard functionality
DATA:environment_types TYPE envi_types,
     output_list TYPE TABLE OF senvi,
     source_searched TYPE TABLE OF rsfind,
     lv_dtel TYPE ddobjname,
     dd04v TYPE dd04v,
     para TYPE tpara,
     state TYPE ddgotstate,
     wa_output TYPE senvi.
PARAMETERS:pa_prog TYPE tadir-obj_name.
START-OF-SELECTION.
  environment_types-dtel = 'X'.
  CALL FUNCTION 'REPOSITORY_ENVIRONMENT_SET_RFC'
       EXPORTING
            obj_type          = 'PROG'
            environment_types = environment_types
            object_name       = pa_prog
       TABLES
            environment       = output_list
            source_objects    = source_searched.
  LOOP AT output_list INTO wa_output.
    lv_dtel = wa_output-object.
    CALL FUNCTION 'DDIF_DTEL_GET'
         EXPORTING
              name     = lv_dtel
              state    = 'A'
              langu    = sy-langu
         IMPORTING
              gotstate = state
              dd04v_wa = dd04v
              tpara_wa = para.
  ENDLOOP.
The table dd04v will have the type and length and the table output_list holds the data element in the program.

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