putting the following code in your ScriptRequestInformation should tell 
ParaView that you can handle sub-divisions:

executive = self.GetExecutive ()
outInfo = executive.GetOutputInformation(0)
outInfo.Set(vtk.vtkAlgorithm.CAN_PRODUCE_SUB_EXTENT(), 1)

it is then up to you, to correctly handle UPDATE_EXTENT() and WHOLE_EXTENT() in 
your Script.

-----------------
Jean/CSCS
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