The problem is that a line constrains 2 dimensions, when in 3d, and you only have one that needs constraining. A plane surface would meet that need, but you do not have one in this instance.As a difference right through the part, you can just drag the extrusion until it creates a hole all the way through, and any extra length will be ignored.. You can allow redundant constraints, or you could create construction line as a diameter of the part, and set the length of the extrusion to be equal. Allowing redundant constraints is the easiest answer.