Translation from the net:
"we were referred on that, that the proprietor data and/or the data of the administrative point of contact of
the domains
- -. de - - -. de - -. de - - -. de - -. de
Correct are not. The entries speak for itself.
In accordance with our domain conditions and -guidelines, you are subject the care duty and the regular
communication of current domain data.
Therefore we must ask you to correct the data of the respective administrative points of contact to the 7
September 2005 per Update.
Therefore we must ask you to announce to the 7 September 2005 the regular address of the respective domain
proprietors to ourselves and to belay this through corresponding proofs.
We refer on that that you presently yourself can carry out no Update on the proprietor data, because the
domains was belaid with a DISPUTE-entry.
Thank you very much for your efforts."
Seems to me that they're asking you to make sure the contact data is correct for the domains -- something that happens each year with some registrars. If you regged them with different whois data, but under one registry account, they can identify your holdings by the account tag.