Please make sure that you have checked in the option of Design structure elevation as you have selected automated design option , it seems to be unchecked in the screenshot. If you could create a service request for the issue & submit your model also we can see the exact problem.To create a service request please go this location: appsnet.bentley.com/.../addcall.aspx and fill out the required information & also mention that you have posted on forums as well.
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