It was quite surprising as Frankfurt is known as German's bank center. How to deal with that ?
Well, before I give you an answer couple you need some explanation. Why do I think that not IBAN bank numbers can be a problem ?
Because it is in my case. Without it I couldn't specify bank transfer through the internet. Therefore I needed to visit my bank. To my surprise they gave me huge form to fill in. When I asked about format for the German bank's data they didn't give me the answer. The only one I've got was: write it down as you think it would be correct.
Great, thanks :/
So, what I did, was to phone to the German bank and ask for the IBAN for that account. Now I have it, but indirectly ;).
When you will ever be looking for the IBAN in such a case please give a try to IBAN rechner :D.