empty attachment with SO_NEW_DOCUMENT_SEND_API1

Hi everyone,

I use SO_NEW_DOCUMENT_SEND_API1 to send mails. Mails are sent without any problem, but there's nothing in the body of the mail. Instead of that, there's an attachement on the mail which is empty.

This is my code :

data: maildata type sodocchgi1.
data: mailtxt  type table of solisti1 with header line.
data: mailrec  type table of somlrec90 with header line.

start-of-selection.

  clear:    maildata, mailtxt,  mailrec.
  refresh:  mailtxt, mailrec.

  maildata-obj_name = 'TEST'.
  maildata-obj_descr = 'Test'.
  maildata-obj_langu = sy-langu.

  mailtxt-line = 'This is a test'.
  append mailtxt.

  mailrec-receiver = 'mail@address.be'.
  mailrec-rec_type  = 'U'.
  append mailrec.


    call function 'SO_NEW_DOCUMENT_SEND_API1'
         exporting
              document_data              = maildata
              document_type              = 'RAW'
              commit_work                = 'X'
         tables
              object_header              = mailtxt
              object_content             = mailtxt
              receivers                  = mailrec
         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 <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
    endif.

Is there anyone who knows why the system behaves like this ?