Adding Attachments in SC

Hello Experts,

I have a requirement of adding attachment during SC creation. The SC is created using FM: BBP_PD_SC_UPDATE, which has the import parameter lt_attach in which i am passing the following values:

   ls_attach-guid                              = lv_guid.

   ls_attach-p_guid                          = ls_item-guid. "item guid

   ls_attach-loio_class                     = 'BBP_L_DOC'.

   ls_attach_kw-phio_class              = 'BBP_P_DOC'.

   ls_attach_kw-phio_version_no      = '00000001'.

   ls_attach_kw-phio_ext                 = 'PDF'.

   ls_attach_kw-phio_fsize               = '2400'.       "(size)

   ls_attach_kw-phio_mime              = 'application/pdf'.

   ls_attach_kw-phio_fname             = lv_fname.      "('name.pdf')

   ls_attach_kw-phio_ps_mime         = 'application/postscript'.

   ls_attach_kw-PHIO_CONTENT[]  = lt_content[].

The hexadecimal content is passed in the lt_content.

Once the SC and PO is created and ordered. When we try to open the attachment in PO, the file (PDF/doc) is not opening as it gets corrupted.

What would be the problem here, is there any other way of doing the attachment. Please assist me in solving this issue.

Thanks

Arun.