I've always found the rule about the number of DOF's before and after a change command kind of weird. I'm sure there is some good reason for it but from a user's point of view it just seems capricious. Are there any plans to make it so you can change supports without regard to how many DOF you have? Does STAAD.X have the same issue? (Is there even any such thing as the change command in STAAD.X?)
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