Return ids of the instances with unattached voids cutting the element. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2011 
Syntax
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Parameters
- element
-  Type:  Autodesk.Revit.DB Element  
 The element being cut
Return Value
Ids of instances with unattached voids that cut this elementExceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |