For column design using "Substructure" (RC Pier) in LEAP Bridge Concrete CONNECT V17, why is the check box for moment magnification gray'd out? I am designing a two column (round) pier with a straight, rectangular bent cap. I have tried to model it both…

I'm designing a hammerhead bent using moment magnification. In the A/D parameters I have selected to design the cap for magnified moments. Once the analysis is complete I design the column and check the design status. I then go to the cap, select design…