You have set the adapter-specific properties to allow the IDoc adapter to recognize the receiver business system.
More information: Configuring the Adapter-Specific Properties
You have created an RFC destination for the receiver 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. If you want the communication channel in the NWA mode to receive ALEAUD from R3 system, you must clone a resource adapter from com.sap.aii.adapter.idoc.raclonetemplateRAR.
More information: Configuring Resource Adapters and JCA Connection Factories in NW
For more information about cloning resource adapters, see the section "Cloning Resource Adapters" under the link : Managing Resource Adapters