Anscheinend handelt es sich doch um einen Fehler im System:
siehe dazu die Email von Amazon:
Dear Mr ...
Thank you for contacting us at Amazon.co.uk.
IŽm sorry to hear about the system error that prevented you from
placing order for video game to Germany.
We are aware of this issue, and our developers are working on a
solution. These errors are normally fixed quite quickly; perhaps
you could try again shortly.
If, after 48 hours there is no change, you can use the link below
to e-mail us so we can look into the situation further:
http://www.amazon.co.uk/email
Also, please be assured that pre orders that are already placed
will be processed as normal. On the date of dispatch, we'll send
you an e-mail message confirming the date, contents and method of
delivery. As per our standard policy, we do not charge you for an
order until the time of dispatch.
Again, I apologise for this inconvenience.
Thank you for shopping at Amazon.co.uk.