Set the source elements for the PartMaker. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
| C# | 
|---|
|  | 
| Visual Basic | 
|---|
|  | 
| Visual C++ | 
|---|
|  | 
Parameters
- sourceElementIds
-  Type:  System.Collections.Generic ICollection   ElementId  
 Elements to be the sources for this PartMaker.
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | One or more element ids was not permitted to be a source for this PartMaker Elements should be Parts that have no PartMaker yet | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |