Thanks Hareesh (It was nice to see you here 
) and Amit and my apologies for not getting back sooner.
There is a small change in requirement at my end. it would be SOAP <-> PI <-> REST (with attachments). REST Call: SAP PI receives a .pdf file in response and SAP PI will need to send the same file as-is (reading the file in PI is not required) to source system. Need your pointers on REST call with attachments and how this could be handled.
Thanks in advance.