Error while re-using view

Hi,
I've several views which i want to re-use but when i add a view which I have already used, i get the error:
Processing HTTP request to servlet [dispatcher] finished with error.
The error is: com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: duplicate usage of view .BasketView
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:515)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.bind(ViewManager.java:397)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:554)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.bind(ViewManager.java:397)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:554)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.bind(ViewManager.java:397)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:554)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.bindRoot(ViewManager.java:421)
     at com.sap.tc.webdynpro.progmodel.view.ViewManager.init(ViewManager.java:130)
     at com.sap.tc.webdynpro.progmodel.view.InterfaceView.initController(InterfaceView.java:41)
     at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:200)
     at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.displayToplevelComponent(ClientComponent.java:135)
     at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:404)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:618)
     at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59)
     at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:251)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:154)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:116)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:48)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:390)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:264)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:347)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:325)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:887)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:241)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
     at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
Why cant I re-use my view?
much thanks,
Hugo

Hallo Nikolay,
my "Modeling Web Dynpro View Composition" tutorial was removed from the Web Dynpro Java sample applications page on SDN because I applied ViewSets and ViewAreas inside windows instead of ViewContainer UI elements inside specific Web Dynpro layout views. Except this sub-optimal (as less flexible; you have more layout and sizing possibilities with ViewContainer UI Elements in virtual layout cells of container UI elements with Matrix or Grid layout in comparison to ViewAreas in ViewSets of a window) technique the tutorial is still very valuable for Web Dynpro application developers. As an example, it demonstrates the concept of creating multiple instances of the same visual component based on separate component usages. This principle is absolutely crucial for developing component-based Web Dynpro applications.
You can read the tutorial description with all related links below.
Regards, Bertram
View Compositions
This Web Dynpro sample application implements a complex view composition. The term view composition describes a set of all view assemblies that can be accessed by navigation. A view assembly consists of normal Web Dynpro views and interface views of Web Dynpro components within the browser window. You can model view compositions in the Navigation Modeler as part of the Web Dynpro tools.
The following options are applicable to model view compositions:
Embedding several views in view setsm, Embedding view sets in each other, Embedding visible Web Dynpro components using their component interface views
In this tutorial, a Web Dynpro component is embedded using two instances.
Embedding views and view sets in view layouts by using the ViewContainerUIElement
Code Sample
The ready-to-use project is available to download from SDN [13TutWD_ViewComposition.zip|https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sapportals.km.docs/business_packages/a1-8-4/13tutwd_viewcomposition.zip]
Corresponding Tutorial: [Modeling View Compositions in Web Dynpro|https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/uuid/2cceb190-0201-0010-be88-acdbeb2ad65f]
Details
Project Template: The initial project (starting point for this tutorial) is available to download from SDN: [13TutWD_ViewComposition_Init.zip|https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sapportals.km.docs/business_packages/a1-8-4/13tutwd_viewcomposition_init.zip]
Level of complexity: Expert
Key features covered: view sets, view assembly, view composition, nested view sets, component interface view, component usage, component reuse, multi-instance capability of Web Dynpro components, UI element Image, UI element ViewContainerUIElement, calculated context attributes
Time required for completion: 2 hrs
Created by: SAP AG

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