Symmetry Constraints on Construction Entities
The only model difference between the two screenshots is that the leftmost and rightmost lines are toggled between construction and "real" geometry. I am very new to Solidworks, but I've done my fair share of Fusion and some Freecad as well. I feel that the screenshots here show a fundamental flaw of connected concerns.
A symmetry constraint should not care whether the constraint targets are "real", and the axis should be forced to be construction. I understand that the solver requires these property values so that it can figure out how to implement symmetry. But if it can't figure it out, it should ask me for the role that each selected entity should play. Instead, the system denies me the right to create a symmetry constraint, thus connecting the concerns of construction/real and symmetry constraint availability in the worst way possible -- by disallowing functionality. Yes I can do (and have done) it another way, but I shouldn't have to.
If this were my software product, I would toss a couple of items in the backlog to fix this. Can someone tell me if I am wrong and why?