XI 2.0 - RFC Adapter Question

Hello,

By SAP XI 2.0 Online documnet about RFC Adapter as follows:

You have the following three possible scenarios when using the RFC Adapter:

SAP Regacy System to SAP Web AS

SAP SAP Web AS to SAP Regacy System

SAP Regacy System to SAP Regacy System

I would like to know if any one knows is it possiable to do the next scenario?

None-SAP System(e.g by File Adapter)=> XI (by RFC Adapter) => SAP Regacy System

Thanks, regards.

Jun Lu