True is dimension has leader with shoulder, false otherwise. 
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2021.1 
Syntax
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Exceptions
| Exception | Condition | 
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| Autodesk.Revit.ExceptionsInvalidOperationException | Dimension must have leader. -or- Thrown when: 
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