I am having an issue today which I had never encountered. On my wall schedule, the 2d plan view of each wall has disappeared. I am wracking my brain here trying to solve. Could use some help.
Which Archicad version and build are you using?
Is this happening in the Schedule Viewpoint or in a Schedule placed as a Drawing on a Layout?
Can you also show the Scheme setup?
Check the Schedule VIEW settings have the walls displayed as required. Go to your floor plan and apply all the same view settings to check the walls are shown including Renovation, MVO etc.