I have spent all morning trying to book a reservation for us in August, using our Global Interrail Pass, for a Blue Star Ferry crossing from Piraeus to Syros.The Pass gives you a 30% reduction and this is indicated on the booking form, with the reduced ticked price. There is a box where you have to fill in your discount details and I give the pass numbers of our activated Global Pass. However, when I get to the point when I want the payment to go through, a box flashes up saying that “The document number is not valid”.I tried this several times, then called the Greek number at the bottom of the page. The very helpful, English-speaking person who answered tried to book this passage for me, but lo and behold, the Global Pass number was indeed not valid. It needed to be a different number from the Rail company, ie Interrail. Nothing on their site, but a useful post on this forum which gave a link to activate a Pass Cover number which could be used for making reservations, starting with I
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