Connection Settings: SAP Gateway to SAP Systems
You must configure settings for SAP Gateway components and define how these settings interface with your existing SAP Business Suite system (backend system).
In the following sections only the basic configuration activities are listed. You can find the complete set of configuration activities in the SAP Gateway Configuration Implementation Guide (IMG) in the system. In transaction SPRO open the SAP Reference IMG and navigate to 
SAP NetWeaver 
SAP Gateway OData Channel Configuration Connection Settings SAP Gateway to SAP System 
.