@check_instance_cell
    def remove_fixed_ip(self, context, instance, *args, **kwargs):
        super(ComputeCellsAPI, self).remove_fixed_ip(context, instance,
                *args, **kwargs)
        self._cast_to_cells(context, instance, 'remove_fixed_ip',
                *args, **kwargs)
Verify that request isn't trying to change a read-create field.
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/compute/cells_api.py/ComputeCellsAPI.remove_fixed_ip--crossover with--dataset/ETHPy150Open mozilla/moztrap/moztrap/model/mtapi.py/MTResource.check_read_create