ABAP Program Send email with PDF Attachment Problem

Hi all,

I am having a problem with my program when I try to send a pdf attachment by email. The email i sent over to the user's inbox but is unable to open the attachment. Error message 'the file cannot be opened and might be damaged' is displayed when trying to open the attachment.

Below is the snippet of my code. please help to see if something is wrong with my code, i have gone through all the forums and still cannot find a solution as it is still giving me the same issue.

*---------------------------------------------------------------------*
* FORM send_email *
*---------------------------------------------------------------------*
* --> p_email *
*---------------------------------------------------------------------*

FORM send_email USING p_email.

CHECK NOT ( p_email IS INITIAL ).
REFRESH it_mess_bod.
* Default subject matter

gd_subject = 'Subject'.
gd_attachment_desc = 'Attachname'.
it_mess_bod = 'Message Body text, line 1'.
APPEND it_mess_bod.
it_mess_bod = 'Message Body text, line 2...'.
APPEND it_mess_bod.

* If no sender specified - default blank
IF p_sender EQ space.
gd_sender_type = space.
ELSE.
gd_sender_type = 'INT'.
ENDIF.

* Send file by email as .pdf
PERFORM send_file_as_email_attachment
tables it_mess_bod
it_mess_att
using p_email
'Test Attachment'
'PDF'
gd_attachment_name
gd_attachment_desc
p_sender
gd_sender_type
changing gd_error
gd_reciever.
ENDFORM.


*&---------------------------------------------------------------------*
*& Form SEND_FILE_AS_EMAIL_ATTACHMENT
*&---------------------------------------------------------------------*
* Send email
*----------------------------------------------------------------------*
FORM send_file_as_email_attachment tables it_message
it_attach
using p_email
p_mtitle
p_format
p_filename
p_attdescription
p_sender_address
p_sender_addres_type
changing p_error
p_reciever.

DATA: ld_error TYPE sy-subrc,
ld_reciever TYPE sy-subrc,
ld_mtitle LIKE sodocchgi1-obj_descr,
ld_email LIKE somlreci1-receiver,
ld_format TYPE so_obj_tp ,
ld_attdescription TYPE so_obj_nam ,
ld_attfilename TYPE so_obj_des ,
ld_sender_address LIKE soextreci1-receiver,
ld_sender_address_type LIKE soextreci1-adr_typ,
ld_receiver LIKE sy-subrc.

data: t_packing_list like sopcklsti1 occurs 0 with header line,
t_contents like solisti1 occurs 0 with header line,
t_receivers like somlreci1 occurs 0 with header line,
t_attachment like solisti1 occurs 0 with header line,
t_object_header like solisti1 occurs 0 with header line,
w_cnt type i,
w_sent_all(1) type c,
w_doc_data like sodocchgi1.

ld_email = p_email.
ld_mtitle = p_mtitle.
ld_format = p_format.
ld_attdescription = p_attdescription.
ld_attfilename = p_filename.
ld_sender_address = p_sender_address.
ld_sender_address_type = p_sender_addres_type.

* Fill the document data.
w_doc_data-doc_size = 1.

* Populate the subject/generic message attributes
w_doc_data-obj_langu = sy-langu.
w_doc_data-obj_name = 'SAPRPT'.
w_doc_data-obj_descr = ld_mtitle .
w_doc_data-sensitivty = 'F'.

* Fill the document data and get size of attachment
CLEAR w_doc_data.
READ TABLE it_attach INDEX w_cnt.
w_doc_data-doc_size = ( w_cnt - 1 ) * 255 + STRLEN( it_attach ).
w_doc_data-obj_langu = sy-langu.
* w_doc_data-obj_name = 'SAPRPT'.
w_doc_data-obj_descr = ld_mtitle.
* w_doc_data-sensitivty = 'F'.
CLEAR t_attachment.
REFRESH t_attachment.
t_attachment[] = it_attach[].

* Describe the body of the message
CLEAR t_packing_list.
REFRESH t_packing_list.
t_packing_list-transf_bin = space.
t_packing_list-head_start = 1.
t_packing_list-head_num = 0.
t_packing_list-body_start = 1.
DESCRIBE TABLE it_message LINES t_packing_list-body_num.
t_packing_list-doc_type = 'RAW'.
APPEND t_packing_list.

* Create attachment notification
t_packing_list-transf_bin = 'X'.
t_packing_list-head_start = 1.
t_packing_list-head_num = 1.
t_packing_list-body_start = 1.

DESCRIBE TABLE t_attachment LINES t_packing_list-body_num.
t_packing_list-doc_type = ld_format.
t_packing_list-obj_descr = ld_attdescription.
t_packing_list-obj_name = ld_attfilename.
t_packing_list-doc_size = t_packing_list-body_num * 255.
APPEND t_packing_list.

* Add the recipients email address
CLEAR t_receivers.
REFRESH t_receivers.
t_receivers-receiver = ld_email.
t_receivers-rec_type = 'U'.
t_receivers-com_type = 'INT'.
t_receivers-notif_del = 'X'.
t_receivers-notif_ndel = 'X'.
APPEND t_receivers.

CALL FUNCTION 'SO_DOCUMENT_SEND_API1'
EXPORTING
document_data = w_doc_data
put_in_outbox = 'X'
sender_address = 'test@email.com'
sender_address_type = 'INT'
commit_work = 'X'
IMPORTING
sent_to_all = w_sent_all
TABLES
packing_list = t_packing_list
contents_bin = t_attachment
contents_txt = it_message
receivers = t_receivers
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.

* Populate zerror return code
ld_error = sy-subrc.

* Populate zreceiver return code
LOOP AT t_receivers.
ld_receiver = t_receivers-retrn_code.
ENDLOOP.

ENDFORM.