File to Sync Webservice interface

Hi,

I have a file to sync webservice scenario

I understand that we can send a response back by using the request response bean but in my case I do not want to send the response back to sender

Can i just create an Async outbound interface and sync inbound interface ...do the mapping for the request part and leave it as it is.

Will it not give error when the response comes back to PI. Or should I just create the Inbound interface also as ASYNC Will the response come back to PI in that case