Expose RFC as Web Service in SAP PI/PO – SOAP to RFC Synchronous Interface

In this article we will look at how to expose a RFC as a Web service in SAP PI/PO. Using SOAP to RFC synchronous interface we would be exposed a RFC as a web service.

Most commonly researched topics under third-party system integration with SAP is how to use RFCs and web services to expose SAP APIs. There are lot of confusion under exposing web services due to different third-party platforms, authentication, connection issues and different PI versions etc.

There are several ways third party applications you can access RFCs.

  • Directly access RFC using SAP credentials.

I have previously written a article on how to access a RFC using .NET front-end.

  • Exposing RFC as a web service using transaction SE37.

This can be done using SE37>Utilities>Create web service option.

  • Exposing RFC as a web-service using SAP Process Integration (PI/PO).

 

In this article I will provide detail on how to expose a RFC as a web service using SAP PI/PO environment. This would be a SOAP to RFC synchronous interface.

 

One advantage of using SAP PI in this purpose is you would have comprehensive monitoring capabilities than other two methods. SAP PI has provided detail message monitoring, message logging and error handling capabilities which can be leveraged for any scenario. if you you use other methods such as directly exposing a RFC you will have to write your own message monitoring, alert and logging.

 

One disadvantage I see in using SAP PI is there would be more development effort due to PI development.

 

This example is a SOAP to RFC synchronous scenario. Third party send the SOAP call can PI converts the input and call the RFC then the RFC return data would be converted and send synchronously to third party using SOAP protocol.

 

Configuration Steps How to Expose RFC as a Web Service using PI/PO.

 

1. Make sure your function module or the API is “Remote enabled”. – SE37

remote-enable-function-module-se37-web-service-abap-pi-po
Remote Enable Function Module in SE37

 

2. Import RFC to SAP PI.

Right click on RFC under imported objects under software component and provide application server/system number/user credential. Then find the RFC from the list.

import-roc-esr-web-service-pi-po
Import RFC in ESR

 

3. Create input, output data types and message types which correspond to SOAP input and output data formats.

SOAP request data/message type.
SOAP response data/message type.

 

4. Create message mapping for SOAP request to RFC input.

soap-to-rfc-request-mapping-web-service-pi-po
Message Mapping for SOAP Request to RFC

 

5. Create message mapping for RFC output to SOAP response.

soap-to-rfc-response-mapping-web-service-pi-po
Message Mapping for RFC Response to SOAP

 

6. Create outbound service interface.

This should be a outbound synchronous interface with SOAP request and response message types.
outbound-soap-interface-web-service-pi-po
Build Outbound Synchronous Interface

 

7. Create operation mapping.

Configure Operation Mapping for request and response.

Operational-Mapping
Build Operational Mapping

 

operation-mapping-soap-rfc-webservice-pi-po
response mapping

 

8. Create sender SOAP communication channel.

soap-sender-communication-channel-configuration-web-service-pi-po
SOAP Sender Communication Channel Configuration

 

9. Create RFC receiver communication channel.

receiver-rfc-communication-channel-configuration-web-service-expose-pi-po
Receiver RFC Communication Channel Configuration

 

10. Create integration scenario.

 

11. Publish the interface under service registry.

if you have any questions on any of the steps discussed how to expose a RFC as a web service, please leave a comment.

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