Master-detail page: insert in detail not working

Hello JHeadstart Team,
I'm using jdev 10.1.3.2.0 and jhs 10.1.3.1.26.
I have a master-detail page (master = table-form layout and (on same page) detail = table layout).
If starting the page, pushing the new master record button, inserting a new master record and finally inserting a new detail record following error occurs:
07/05/02 14:50:30 [720] (16) DCBindingContainer.reportException(220) DCBindingContainer.reportException :oracle.jbo.TxnValException
07/05/02 14:50:30 [721] (16) Diagnostic.printStackTrace(410) oracle.jbo.TxnValException: JBO-27023: Validieren aller Zeilen in einer Transaktion nicht möglich.
and for every mandatory column in the detail
## Detail 0 ##
oracle.jbo.RowValException: JBO-27027: Fehlende obligatorische Attribute für eine Zeile mit dem Schlüssel oracle.jbo.Key[-5 ] vom Typ Quellen
     at oracle.jbo.server.JboMandatoryAttributesValidator.validate(JboMandatoryAttributesValidator.java:118)
There is also a warning in the embedded OC4J log
02.05.2007 14:49:26 oracle.adfinternal.view.faces.model.binding.FacesCtrlRangeBinding$FacesModel getSelectedRow
WARNUNG: rowIterator is null
If I query the data first I can insert master and detail records as exspected! The same if the details are placed on a separate page!
Trying to use the new feature AddRow-Button for table layout gives ALLWAYS
500 Internal Server Error (
javax.faces.el.EvaluationException: java.lang.NullPointerException     
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:150)     
at oracle.adf.view.faces.component.UIXComponentBase.__broadcast(UIXComponentBase.java:1087)     
at oracle.adf.view.faces.component.UIXCommand.broadcast(UIXCommand.java:204)     
at oracle.adf.view.faces.component.UIXCollection.broadcast(UIXCollection.java:95)     
at oracle.adf.view.faces.component.UIXTable.broadcast(UIXTable.java:208)     
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:287)     
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:401)     
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:95)     
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:245)     
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:110)     
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:213)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64)     
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:162)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:15)     
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._invokeDoFilter(AdfFacesFilterImpl.java:228)     
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._doFilterImpl(AdfFacesFilterImpl.java:197)     
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl.doFilter(AdfFacesFilterImpl.java:123)     
at oracle.adf.view.faces.webapp.AdfFacesFilter.doFilter(AdfFacesFilter.java:103)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:620)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:369)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:865)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:447)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:215)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:117)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:110)     
at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)     
at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:239)     
at oracle.oc4j.network.ServerSocketAcceptHandler.access$700(ServerSocketAcceptHandler.java:34)     
at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:880)     
at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.1) ].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)     
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.NullPointerException     
at oracle.jheadstart.controller.jsf.bean.JhsCollectionModel.addRow(JhsCollectionModel.java:443)     
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)     
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)     
at java.lang.reflect.Method.invoke(Method.java:585)     
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:146)     
... 30 more
In the ADF BC Tester the application module runs properly.
How can I debug?
Is there something wrong in the model level or view level?
Thanks in advance
Peter

Thanks Menk for your idea!
I located the source of the problem in the pagedef:
After changing the RefreshCondition of the Detail Iterator from
<iterator id="DETAILIterator" Binds="DETAILView1"
DataControl="xyzDataControl" RangeSize="-1"
RefreshCondition="#{searchMASTER.queryExecuted}"/>
to
<iterator id="DETAILIterator" Binds="DETAILView1"
DataControl="xyzDataControl" RangeSize="-1"
RefreshCondition="#{adfFacesContext.postback == true}"/>
and switching off "Generate Page Definiton" everything works as exspected!
Peter

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