Some Void Forms of this family do not cut anything and will be deleted. To make a Void Form cut something else use the Cut Geometry tool.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34)
Syntax
C#
public static FailureDefinitionId VoidFormsNotUsed { get; }