Hi Deb,
I don't remember, but doesn't the SharePoint list adapter load the data as one collection (flat list)? If so, I'm guessing it's a schema issue. Master/Detail wants you to specify two collections. You could add some code to move the history records into a separate group and then set it up.
One more note: master detail only works on main data source, so you will have to move the data into your main data source to get it to be enabled in the content model editor (data source pane).
Patrick Halstead
Project Manager at Qdabra