SAP XI provides different ways for SAP systems to communicate via SAP XI. You have three options namely IDoc Adapters, RFC Adapters and Proxies. In one of the earlier posts that spoke about your first XI scenario, we learned configuring the IDoc receiver adapter. And in the coming articles, I shall throw light on different adapters. This article specifically deals with understanding basics of RFC adapter on sender and the receiver side.

RFC Adapter converts the incoming RFC calls to XML and XML messages to outgoing RFC calls. We can have both synchronous (sRFC) and asynchronous (tRFC) communication with SAP systems. The former works with Best Effort QoS (Quality of Service) while the later by Exactly Once (EO).

Unlike IDoc adapter, RFC Adapter is installed on the J2EE Adapter Engine and can be monitored via Adapter Monitoring and Communication Channel Monitoring in the Runtime Workbench.

Now let us understand the configuration needed to set up RFC communication.

RFC Sender Adapter

In this case, Sender SAP system requests XI Integration Engine to process RFC calls. This could either be synchronous or asynchronous.

On the source SAP system, go to transaction SM59 and create a new RFC connection of type ‘T’ (TCP/IP Connection). On the Technical Settings tab, select “Registered Server Program” radio button and specify an arbitrary Program ID. Note that the same program ID must be specified in the configuration of the sender adapter communication channel. Also note that this program ID is case-sensitive.

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