The European Union believes that resident discounts amount to unequal treatment of people from other countries.
245 of the incidents that had been reported by midday were in Majorca, with more than a third having been in Palma.
The two floors are valued together at almost four million euros.
15.4 million euros have been offered by way of compensation. If this is not acceptable, the courts could become involved.
More than 1.5 million tickets were sold in 2016, 95.4% of them to non-residents.