Create Master Detail on a single page

I have a create page with both the master(header) as well as (lines) on the same page.
Here is the page flow:
User navigates to the search screen on which the create button is displayed along with Search/Results regions.
User clicks on create button which takes them to Create Order Page.
The Create Order Page is a master-detail page. I have the create part for the header (which was tested independently before
the details table region is added) working fine which fetches and assigns the headerId from a sequence.
However, when I add the details table region and include the create Row method for the details Row as well , without explicitly
setting the headerId myself and render the page, I get the following exception. This exception is raised as soon as the control reaches the createRow
method of the detail.
This is probably due to the HeaderId being not yet available. How do I get around this issue.
I was initially thinking of setting the attribute myself but the documentation says that when an Composition association
exists between the Entity Objects, OA automatically does it for you.
I included the detailVO in the AM via the view link.
Exception
oracle.apps.fnd.framework.OAException: oracle.jbo.InvalidOwnerException: JBO-25030: Failed to find or invalidate owning entity.
     at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:888)
     at oracle.apps.fnd.framework.OAException.wrapperException(OAException.java:862)
     at oracle.apps.fnd.framework.OAException.wrapperInvocationTargetException(OAException.java:985)
     at oracle.apps.fnd.framework.server.OAUtility.invokeMethod(OAUtility.java:210)
     at oracle.apps.fnd.framework.server.OAUtility.invokeMethod(OAUtility.java:152)
     at oracle.apps.fnd.framework.server.OAApplicationModuleImpl.invokeMethod(OAApplicationModuleImpl.java:692)
     at nih.oracle.apps.po.webui.NihPoStOrdCreateCO.processRequest(NihPoStOrdCreateCO.java:65)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:518)
     at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:244)
     at oracle.apps.fnd.framework.webui.OAPageLayoutHelper.processRequest(OAPageLayoutHelper.java:920)
     at oracle.apps.fnd.framework.webui.beans.layout.OAPageLayoutBean.processRequest(OAPageLayoutBean.java:1536)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:866)
     at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:833)

After creating your master entity row, use setCurrentRow(<newly created row obj.>)

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