How and with what kind of views do you populate the ScrollView?
To add OSMMapView on the ScrollView you must add it onto the ScrollView.Panel like:
Code:
ScrollView1.Panel.AddView(OSMMapView, 0, 0, ScrollView1.Panel.Width, 47%y)
Add the other views below OSMMapView.
And then set ScrollView1.Panel.Height to the appropriate value.
Best regards.