To implement the second scenario, which is described in Extending the SAP call out to a synchronous system sample, you require information from your SAP administrator or developer to access an external system from SAP.
The steps for creating your adapter and message set are the same as when you implement a predefined BAPI, which is described in Building the SAP call out to a synchronous system sample. The equivalent of the shared variable in the sample (for example, IMS or DB2) requires nodes that are specific to your external system, which have their own samples (for example, a Database node for DB2 or an IMSRequest node for IMS).
Information that is required to build the adapter and message set:
Additionally, you must give the SAP administrator and SAP developer the RFC program identifier that you are using.