def check_ten_percent_voltage_deviation(network):
    """
    Checks if 10% criteria is exceeded.

    Parameters
    ----------
    network : :class:`~.grid.network.Network`

    """
    v_mag_pu_pfa = network.results.v_res()
    if (v_mag_pu_pfa > 1.1).any().any() or (v_mag_pu_pfa < 0.9).any().any():
        message = 'Maximum allowed voltage deviation of 10% exceeded.'
        raise ValueError(message)
