Creates a report and tries to open it

opendocumentreportshow(nameOfViewModel)  

You supply the name of the viewmodel using either a string, like

self.opendocumentreportshow('myviewmodelname')

or by using the viewmodel expression like

self.opendocumentreportshow(<classname>.ViewModels.<myviewmodelname>)

See also Microsoft office and OpenDocument as a Report generator, OpenDocument fine tuning, OpenDocument