Sorry for posting in English, I roughly understand German but I did not actually speak since a few years :\
I've got the exact same problem - I've entered my account data, got the transfer, but I can't view the validation code. At the detailed view of the transfer I have the sender name and some reference string, but the validation code is missing - it probably got trimmed by the bank because the info was too long. I've sent an email to bitmarket.de support, no answer. I've also posted a support request with a screenshot of my transfer details using their support widget, still no answer
