How to convert IDOC-PI-JMS to IDOC-PI-File with exsting mapping?

I have a scenario, ECC-PI-Message broker. ECC sending IDOC to PI, PI execute mapping and sends data to Message borker(thru JMS channel).(with almost one to one mapping)., IDOC(AAE)-PI-JMS. Now my requirement is., from PI after mapping we need to create file with same data what ever send to Message broker and put the file in SAP folder without touching mapping. Is it possible? Please advise with the steps. We are using the ICO for this senario. Quick response is appriciated.