Is it possible to use several RootAppModules in one UIX Page?

Hello,
I want to use two RootAppModules in one uix page. The reason is, that application modules look at different database connections.
I get this NullpointerException:
java.lang.NullPointerException
     void oracle.cabo.data.jbo.ui.data.ViewObjectDataProvider.init(oracle.cabo.ui.RenderingContext)
     void oracle.cabo.ui.data.provider.TableDataProvider.init(oracle.cabo.ui.RenderingContext)
     void oracle.cabo.ui.data.provider.CachingDataProvider.init(oracle.cabo.ui.RenderingContext)
     void oracle.cabo.ui.data.provider.DataProviderStack.addDataProvider(oracle.cabo.ui.RenderingContext, oracle.cabo.ui.data.DataProvider)
     void oracle.cabo.ui.LogicalNodeRenderingContext.addDataProvider(oracle.cabo.ui.data.DataProvider)
     void oracle.cabo.ui.composite.CompositeRenderingContext.addDataProvider(oracle.cabo.ui.data.DataProvider)
     void oracle.cabo.ui.laf.base.DataScopeRenderer.prerender(oracle.cabo.ui.RenderingContext, oracle.cabo.ui.UINode)
     void oracle.cabo.ui.BaseRenderer.render(oracle.cabo.ui.RenderingContext, oracle.cabo.ui.UINode)
In my page I have two Registry entries and in my page content I open the second AppModuleScope after closing the first AppModuleScope.
I am using JDeveloper 9.0.3.2. The documentation says it should be possible???
Thanks,
Christian

I explored my problem yesterday and this are my results.
Everything works fine, so using different root application modules, if I come from a simply navigation event handler.
But when I use my own event handler which itself is enclosed in an root application module scope, the next page is not able to render data coming from different root application modules.
The event handler of my source page looks like this:
<event name="selectionEvent">
<bc4j:findRootAppModule name="MyRootAppModule">
<bc4j:findViewObject name="MySelectionVo">
<instance class="test.MySelectionEventHandler"/>
</bc4j:findViewObject>
</bc4j:findRootAppModule>
</event>
Regards,
Christian

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