Hi, i work mainly with 4 classes. CalculationManager: - serves the business logic for the interaction with the user - holds a Calculation Object Calculation: - Entity Bean - holds all data provided by the user ExpressCalculator: - executes a calculation for a passed Calculation object - returns a BudgetOverview object BudgetOverview: - holds all data which should be returned to the user Workflow: 1. every time the user starts a calculation a (long running) conversation is started and a Calculation object is created which holds all data. 2. When the user has passed all information a calculation is executed. and the response is stored in the BudgetOverview object 3. the CalculationManager gets this BudgetOverview object and outjects it to the conversation scope. Then the user is redirected to the page where the response is rendered and after that the conversation ends. And within the BudgetOverview there is the DataModel selectitems which should also be outjected to the conversation scope. the part of the xhtml looks like that: <ui:define name="content"> | <h1>Budget Overview</h1> | <div> | <span>BuildingTyp: </span> | <h:outputText value="#{budgetOverview.buildingType}"/><br/> | <span>Area: </span> | <h:outputText value="#{budgetOverview.area}"/> | </div> | <h:dataTable value="#{costitems}" var="item"> | ... columns | </h:dataTable> | </ui:define> works fine fot the #{budgetOverview.attributes} but not for the @Datamodel thanks for help, hasc View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4047182#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...