A Subregion cannot be created outside the boundary of a Toposurface.
A Subregion should be completely inside a Toposurface or overlap a Toposurface.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0)
Syntax
C#
public static FailureDefinitionId SubregionNoHostSurf { get; }