Can't scale because Move Plane is at a very sharp angle in this view. Change view angle or go to another view.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0)
Syntax
C#
public static FailureDefinitionId CannotScaleInView { get; }