The app is wrong, you don’t need a supplement. You can buy a seat reservation if you want however but they are not mandatory until 31st may

@Mukhammad @Camilo. Interrail/Eurail pass holders never need an extra supplement for the ICE Amsterdam-Germany. Not even for domestic journeys within the Netherlands. Can this please be removed from the app?

@rvdborgt It seems this bug comes back affecting the data sent by NS to Merits. Camilo has reported this case, so please wait till it's revised

Hi all, 

Received an update from our timetable expert! Seems like removing the attribute from our timetable is a bit tricky because we're pulling data directly from NS. We've escalated the issue to the HACON system and now we're waiting for their response. We'll make sure to keep you in the loop!

Thank for the patience!