Element Profiles not working when using Xref'd file

Hi

I am using OpenRoads Design Connect Edition V10.07.00.56 and am having trouble with getting profiles from an xref'd file to project with all the options available under "Element Profiles".

I have a separate file for my point control elements and centre line and am trying to project the vertical profile of my centre line onto a point control, but get "Element is in a ReadOnly reference" when I try to select the centre line.

I have tried turning on "Treat Attachment as Element for Manipulation", but then get "Element Type is not valid for this tool".

Any help would be greatly appreciated,

Thanks