Publishing Interface as Web Service (Web Service to RFC)

By Neeraja Surapaneni, YASH Technologies

This step-by-step document describes how to publish the Interface as web service from XI. 

Business process: 

In this example we are publishing outbound interface as web service. When the interface is defined as web service in the Integration directory, it will generate a WSDL document. Using this WSDL we can create SOAP request with the help of third party tools like XML SPY or Microsoft InfoPath. When this SOAP request is send to the XI system it will invokes the RFC “ZSYNCGETSFLIGHTDET_E6S_800” in SAP R/3 system and this RFC returns the response back to the SAP XI. The SAP XI collects the response and maps to the WSDL response, which in turn is sent back to third party system XML SPY or Microsoft InfoPath.  

About RFC 

The RFC “ZSYNCGETSFLIGHTDET_E6S_800” when executed on E6S system client 800 with import parameters CONNID and CARRID checks whether the combination exist in SAP database table SFLIGHT or not? If the combination exists then it will return FLAG as ‘0’ otherwise returns FLAG as ‘4’.  

1.       Create RFC in the R/3 system

First we need to create the RFC ZSYNCGETSFLIGHTDET_E6S_800 in R/3 system with import parameters as CONNID, CARRID and export parameters as CONNID, CORRID and FLAG. 

Go to Transaction SE37 to create RFC.

2.       Design the interfaces in Integration Repository

Start up the home page of the Exchange Infrastructure Tools using transaction SXMB_IFR. Click on the Integration Repository under Integration builder.  

2.1    Import RFC:- Import the RFC that we have created in the above step from the corresponding R/3 system. To import RFC right click on RFC’s which is under the Imported Objects under the Software component version. 

When we import RFC’s we will get both Request messages and Response messages. This imported RFC can be used as Message Interface.

2.2    Define Request and Response Data Types:- Define a new data types for each Request and Response messages of imported RFC.

The structure of Request data type should resemble Import parameters of RFC

The structure of Response data type should resemble Export parameters of RFC.

2.3    Define Request and Response Message Types:- 

Create Request Message Type by encapsulating Request data type.

Now create Response Message Type by encapsulating Response data type.  

2.4    Create outbound synchronous Message Interface

We are going to publish this Outbound Message Interface as Web service in Integration Directory. Once we define this interface as web service it will generate WSDL file. Using this file we can create a SOAP request using third party tools like XML SPY or Microsoft Info path.

2.5    Create Message mappings

Here we need to create two message mappings, the first mapping is between Request message type and RFC Request message and the second mapping is between RFC Response message and Response message type. 

Request message mapping

Response message mapping

2.6    Create Interface mapping

As the Interface is Synchronous it will ask for the Request and Response

Activate all the changes by clicking on Change lists tab.

Click here to continue...