Deutsche Bahn: What does "Train not bookable until further notice" mean?

I am trying to book a train from Deutsche Bahn, that shows a message "Ticket not bookable until further notice" (in the English version of the website) in its listing. However, the button to book is active, and on proceeding I can reach up to the payment page without any issues. I did not try proceeding further since I want to make sure it won't cause problems later.

What does this message exactly mean?

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Can I take an earlier train Deutsche Bahn?

You can only take the train for which you have been issued a ticket for. If you wish to depart earlier or later, you will have to cancel and re-book your ticket for a fee of \u20ac17.50. Once you have done this, you can then choose a new departure time for your ticket.

What does ERW mean on German train ticket?

Erwachsener means adult in German. On mobile tickets, this is abbreviated as "Erw".

How do you know if a seat is reserved on a German train?

If you do have a reservation, the seats will be marked by a small electronic displays somewhere above each pair of seats.

How do I read my Deutsche Bahn ticket?

Translated Deutsche Bahn Ticket

the departing station (Berlin Hbf),

the destination station (Praha hl. n.),

the date of the trip (11.01, or January 11th\u2014 remember that in Europe, days and months are inverted, so that they read: DD. MM. ...

the time of departure, as well as the departing platform,

and the train number.

Chaos for €9! Or: When is an RE train not an RE train?

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