You have set the adapter-specific properties to allow the IDoc adapter to recognize the sender business system.
More information: Configuring the Adapter-Specific Properties
You have created an RFC destination for the sender business system using the NWA. For example: XI_IDOC_DEFAULT_DESTINATION_SID
More information: Maintaining RFC Destinations
If you want to configure the communication channel in NWA mode you must configure a JCA connection factory on the outboundRA resource adapter so that an ALEAUD can be sent to the R3 system. If you want the communication channel in the NWA mode to receive IDoc from R3 system you must clone a resource adapter from com.sap.aii.adapter.idoc.raclonetemplateRAR.
For more information about cloning resource adapters, refer to the section "Cloning Resource Adapters" in the link : Managing Resource Adapters