SO_NEW_DOCUMENT_ATT_SEND_API1 - Release 7.0 Issue

Hi all!

I'm just upgrading my Sap from release 4.7 to release 7.0 and i got an issue with the F.M. "SO_NEW_DOCUMENT_ATT_SEND_API1".

All the attachments are truncated but they are all small than 255 characters

This is my code, can anyone tell me what i'm missing?

CLEAR receivers_tab. REFRESH receivers_tab. 
    LOOP AT address. "Upload addresses
    receivers_tab2-rec_date = sy-datum.
    receivers_tab2-rec_type = 'U'.
    receivers_tab2-receiver = address.
    APPEND receivers_tab.
  ENDLOOP.

* E-Mail Header and body message
  CLEAR document_data.
  document_data-obj_name   = 'Spedizioni. "Nome doc.
  document_data-obj_langu  = 'I'.            "Lingua
  document_data-sensitivty = 'O'.            "Sensibilità: Standard
  CONCATENATE 'Sped da' t_dest_mail-vstel
    INTO document_data-obj_descr SEPARATED BY space.

* Riempimento contenuto e-mail (EMAIL BODY)
  DATA va_line LIKE soli-line.
  CLEAR contenuto. REFRESH contenuto.
  WRITE: 'Data:'  TO va_line(5),
         sy-datum TO va_line+6(10) DD/MM/YYYY,
         'Ora:'   TO va_line+18(4),
         sy-uzeit TO va_line+23(8) USING EDIT MASK '__:__:__'.
  PERFORM: riempi_riga TABLES contenuto USING va_line,
           riempi_riga TABLES contenuto USING '',
           riempi_riga TABLES contenuto USING text-102, "Si prega ...
           riempi_riga TABLES contenuto USING '',
           riempi_riga TABLES contenuto USING text-103.

{color:green}* Attachment
* This is the old way i create the attachment and at the end, my CONTENTS_BIN contain all the 
* Line
  DATA: va_line_bin LIKE soli-line.
 
  CLEAR va_line_bin.
  LOOP AT t_attach.
    WRITE t_attach TO va_line_bin.
    PERFORM riempi_riga TABLES contents_bin USING va_line_bin.
    CLEAR va_line_bin.
  ENDLOOP.
{color}

*     Informazioni aggiuntive per allegato e-mail (dimensione)
  DATA n LIKE sy-tabix.
  DESCRIBE TABLE contenuto LINES n.
  document_data-doc_size = n * 255.
*     Descrizione componenti oggetto importati
  CLEAR packing_list-transf_bin.
  packing_list-body_num = n.
  packing_list-doc_type = 'RAW'.
  APPEND packing_list.
*     Creazione del documento allegato (CONTENTS_BIN)
  DESCRIBE TABLE contents_bin LINES n.
  object_header = 'SPEDIZIONI.CSV'. "Nome al salvataggio
  APPEND object_header.

* CREATION OF THE ENTRY FOR THE COMPRESSED ATTACHMENT
  packing_list-transf_bin = 'X'.
  packing_list-head_start = 1.
  packing_list-head_num   = 1.
  packing_list-body_start = 1.
  packing_list-body_num   = n.
  packing_list-doc_type   = 'RAW'.    "Formato allegato
  packing_list-obj_name   = 'FILE_SPED'.
  packing_list-obj_descr = document_data-obj_descr.

{color:green}
* Here i create the new CONTENT_HEX table, which seems to be truncated.
  FIELD-SYMBOLS: <fs_solix> TYPE solix.
  DATA : content_hex TYPE STANDARD TABLE OF solix WITH HEADER LINE.


  REFRESH content_hex.

  LOOP AT  contents_bin.
    CONDENSE contents_bin-line.
    ASSIGN contents_bin TO <fs_solix> CASTING.
    APPEND <fs_solix> TO content_hex.
  ENDLOOP.
  READ TABLE content_hex INDEX n.
*
{color}
* ITSIMIL 13/01/2009 - fine
  packing_list-doc_size   = n * 255.
  APPEND packing_list.

  CALL FUNCTION 'SO_NEW_DOCUMENT_ATT_SEND_API1'
    EXPORTING
      document_data              = document_data
      put_in_outbox              = 'X'
    TABLES
      packing_list               = packing_list
      object_header              = object_header
*      CONTENTS_BIN               = CONTENTS_BIN
       contents_hex               = content_hex
       contents_txt               = contenuto
      receivers                  = receivers_tab2
    EXCEPTIONS
      too_many_receivers         = 1
      document_not_sent          = 2
      document_type_not_exist    = 3
      operation_no_authorization = 4
      parameter_error            = 5
      x_error                    = 6
      enqueue_error              = 7
      OTHERS                     = 8.
  IF sy-subrc NE 0.
    MOVE 'X' TO flag.
  ENDIF.
  COMMIT WORK.