You can only give one type of object as the page parameter on a page. This is the dataview that contains everything in the page.
In order to use two different dataviews you can set one as the page parameter, but the other one needs to have a different datasource.
You can do this by double clicking the dataview and set a micro/nanoflow as datasource. If the situation allows it you can also set the source to listen to widget.
Hope this helps!