The id of the FamilySymbol to represent a user-defined boundary condition. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2011 
Syntax
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | When setting this property: A non-optional argument was null | 
| Autodesk.Revit.Exceptions DisabledDisciplineException | When setting this property: None of the following disciplines is enabled: Structural. |