Creates a new material takeoff multicategory schedule assembly view for the assembly instance. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 17.0.0.0 (17.0.1090.0) 
  Since:  2017 
Syntax
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Parameters
- document
-  Type:  Autodesk.Revit.DB Document  
 The document to which the view will be added.
- assemblyInstanceId
-  Type:  Autodesk.Revit.DB ElementId  
 Id of the assembly instance that owns the new view.
- viewTemplateId
-  Type:  Autodesk.Revit.DB ElementId  
 Id of the view template that is used to create the view; if invalidElementId, the view will be created with the default settings.
- isAssigned
-  Type:  System Boolean  
 If true, the template will be assigned, if false, the template will be applied.
Return Value
A new material takeoff multicategory schedule assembly view.Remarks
 The material takeoff schedule will be preloaded with fields "Material: Name" and "Material: Volume". The document must be regenerated before using the schedule. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | assemblyInstanceId is not an AssemblyInstance. -or- viewTemplateId is not a correct view template for the schedule view. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL | 
| Autodesk.Revit.Exceptions ModificationForbiddenException | The document is in failure mode: an operation has failed, and Revit requires the user to either cancel the operation or fix the problem (usually by deleting certain elements). -or- The document is being loaded, or is in the midst of another sensitive process. | 
| Autodesk.Revit.Exceptions ModificationOutsideTransactionException | The document has no open transaction. |