Can't select 2D reference when placing civil cell

I'm trying to place a civil cell on a T-junction but am getting the "element not valid for tool" error. The first reference line is the minor road CL, and the second is the major road EOP line. This second line is in the 2D model with no profile attached, but I still can't select it:

The original EOP line was 3D and imported from an MX model, but I created a 2D line using the Plan by 3D Element option. I've tried using this option to create a 2D version of my first reference but I can't select this at all when placing the cell.

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