Providing Web Services 
This chapter describes how to develop a Web Service using the outside-in approach. The special thing about this approach is that, irrespective of an implementation, you first define the interface of a service in the ES Repository . Depending on the application scenario the Web Service can then later be called in different ways, for example, point-to-point or using the Integration Server.
The following are relevant as provider of a Web Service:
The Web Service is to be implemented as part of an SAP application and can be called at the customer-side by a consumer.
To cover the requirements of a customer, an Independent Software Vendor (ISV) enhances an SAP application around a Web-Service.
Customers and Partners can create additional Web Services for their applications.
Note
If services are developed for an application within a business then it is likely that the provider-side and consumer-side of a point-to-point communication in a department will be developed. You can then combine the steps in the ES Repository - different to those shown here (more information: Services for Developing a Point-To-Point Communication).
Procedure
Proceed as described in the following chapters: