The Surface being Graded was created in the current Phase. Grading it will result in it being created and destroyed in the same Phase.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34)
Syntax
C#
public static FailureDefinitionId GradingInSamePhase { get; }