Needs content not in pdf format

Hi all,,

I have an ABAP program where i could send mails to the recipients.

But the recipients are able to receive the content of the mails only in attached pdf format.

But could not get into the body of the mail.

I had passed packing_list-Document type = 'RAW' in in so_document_send_API1

What should i need to do in the settings..

will be awarded..