On the View menu, click Display Errors to validate a 2D floor plan. In a 3D analysis view this brings up the errors and warnings dialog, if any errors and warnings are present. The function will highlight walls less than 0.2m in length. Wall lengths less than 0.2m are known as "short walls" in Tas. The validation procedure will remove short walls where possible. Short walls do not prevent the geometry data from exporting to TBD but in certain cases they can cause simulation errors.