Reading FI archived Attachments

Hi Experts,

                   We are facing issue with Archival attachments in fiori launchpad.

                   We are using FM BDS_ALL_CONNECTIONS_GET inside workflow to get attachments relevant to documents.

                   This attachments is passed to dialog task via binding to _Attach_Objects.

                   Normal attachment we can see that is FIPP attachments. But when we are trying to get archived attachments  with

                  FM  BDS_ALL_CONNECTIONS_GET  passing object as BKPF we are not getting attachment details of SOPF.

                 Please suggest how to read archived FI document in SOPF format.

Regards,

Aditya