If the Web service consists of an input operation as well as an output operation, the user has to select for both a UI component to support interaction. If no UI component is retrieved, where the interface does not fit entirely with the interface of the Web service operation, the client application provides the user the possibility to perform manual changes regarding for example the connection of the parameters in a visual art. In addition, the client application displays the generic UI components, which is already adapted to the data structure of the Web service operation.