The information in this article applies to:
I am receiving the following warning, how can I stop this from displaying in my plan?
"A wall designated "extend slope downward" must connect at each end to two perpendicular walls that extend from it in the up roof slope direction. Each of these walls must be designated a "full gable wall"."
Only check Extend Slope Downward to extend the roof plane downward over a bumpout, instead of creating additional roof planes. The two connecting walls that create the bumpout must be Full Gable walls.
In the following image, the bearing wall of the bumpout has Extend Slope Downward checked. The two short side walls are Full Gable walls.