I want recover in ABAP program a "Long Text"

Question

Hi, 
In FB01 transaction when you go to "Enter Fixed Asset posting: Correct G/L account item", there are a button with a label: "Long Text". When you push this button appear a little window with name "Long Text for Document Line Item" and you can write a long note for a document. I want to recover this long note in a ABAP program. I want know where SAP keeps this texts and how I can recover it. 
A lot of thanks in advance. 
Regards.

Answer 1

Now, my code is:
report zutil060.
data: l_thead like thead.
data: it_text like  tline occurs 0 with header line.
call function 'ZREAD_TEXT'
     exporting
          id       = '0001'
          language = sy-langu
          name     = 'EV1000000811282006001'
          object   = 'DOC_ITEM'
     tables
          lines    = it_text.
  l_thead-tdobject = 'DOC_ITEM'.
  l_thead-tdspras = 'ES'.
  l_thead-tdid = '0001'.
  l_thead-tdname = 'EV1000000811282006001'.
  refresh it_text.
  clear it_text.
  it_text-tdline = 'Hola caracola'.
  it_text-TDFORMAT = '*'.
  append it_text.
  call function 'SAVE_TEXT'
    exporting
      client          = sy-mandt
      header          = l_thead
     insert          = 'X'
      savemode_direct = 'X'
    tables
      lines           = it_text
    exceptions
      id              = 1
      language        = 2
      name            = 3
      object          = 4
      others          = 5.
  if sy-subrc <> 0.
  write:/ sy-subrc.
  endif.
If i comment "insert          = 'X'" sy-subrc is 0 but text note dont change.
My finally mission is to makes an interface (ABAP program) and this program should pick up the long notes from another system and to create new ABAP notes.
Now i only need to know how i can insert or change a new long note.
a lot of thanks for your time.
regards.