def reset_all_to_flows(self, force=False):
        """ Resets the IOSystem and all extensions to absolute flows

        This method calls reset_to_flows for the IOSystem and for
        all Extensions in the system.

        Parameters
        ----------

        force: boolean, optional
            If True, reset to flows although the system can not be
            recalculated. Default: False

        """
        self.reset_to_flows(force=force)
        [ee.reset_to_flows(force=force)
         for ee in self.get_extensions(data=True)]
        self.meta._add_modify("Reset full system to absolute flows")
        return self