POint Control - Element Not valid for tool

I am trying to create a point control for an End condition point. I am using "linear geometry" option and selected a corridor line (of a different corridor from a referenced DGN).

On trying to select the target line, i get a pop up message "element not valid for tool". on trying "feature definition"  option in point control, there is no change in the corridor (Corridor reference was added prior to point control.)

Please help