I'm work with Aeroo report in OpenERP. I define function called fill_stars(self, amount): which takes the amount and convert into text format.
While I'm going to print report, it gives following error
Exception: (u'Aeroo Reports: Error while generating the report "Invoice Report".', UndefinedError('"fill_stars" not defined',))
I check the track-back and the result is that "function is not called".