BPM to soap Attachment

Hi

My Scenario is from BPM to soap in synchronous mode in PO.

BPM is sending request to web service and getting response as attachment in Excel file.

for BPM to PI  connection ,PI is using sender soap adapter with XI 3.0 message protocol .

for webservice to PI connection .PI is  using receiver soap adapter with message protocol soap 1.1.

is it possible to receive excel sheet as attachment from receiver soap adapter ?

is it possible process excel sheet as attachment to BPM using XI3.0 message protocol?

Thanks

Harsh