Exception when open DetailView from ListView for persistent object stored in ObjectSpaceInMemory

Hello Sergey,
Thanks a lot for reporting this issue. We see the problem but it requires additional research from our side. Presently, to bypass the problem, override the GetObjectSpaceToShowViewFrom method of your application class as follows:

C#
public override ObjectSpace GetObjectSpaceToShowViewFrom(Frame sourceFrame) {  
    if(sourceFrame != null && sourceFrame.View != null) {  
        InMemoryDataStore dataStore = ((DevExpress.Xpo.Helpers.BaseDataLayer)(sourceFrame.View.ObjectSpace.Session.DataLayer)).ConnectionProvider as InMemoryDataStore;  
        if(dataStore != null) {  
            return ObjectSpaceInMemory.CreateNew(  
                ((InMemoryDataStore)((DevExpress.Xpo.Helpers.BaseDataLayer)(sourceFrame.View.ObjectSpace.Session.DataLayer)).ConnectionProvider).Data);  
        }  
    }  
    return base.GetObjectSpaceToShowViewFrom(sourceFrame);  
}  

We will get back to you ASAP.
Thanks,
Dennis

Hello Sergey,
We have to set the state of this bug to "Won't fix". To work properly with non-persistent objects, changes in the core of our framework are needed. Please track this suggestion in this regard: Core - Improve usability and support more scenarios of working with non-persistent objects.
Currently, you can use the workaround shown above. It is for version 9.1.
For the version 8.3 you will need to override the GetObjectSpaceToShowViewFrom method of a custom ShowViewStrategyBase descendant. To enable your custom view strategy, you have to override the CreateShowViewStrategy method of the XafApplication. Please see the MDIDemo for more information on how to use custom view strategies.
Thanks,
Dennis