Wilkommen, Volker!
Don't use Zeos, but when asking questions on the forum, it helps to specify your operating system, Lazarus version (+FPC version if not using a stable Laz version), and in this case the Zeos version. If you're not using Zeos 7, I'd think the Zeos guys would recomment upgrading to Zeos 7.
Finally, you posted this in the LCL section of the forum; a better place for these kind of questions would be the Databases section.
Hope somebody can answer your question instead of telling how you should be asking questions
regards,
BigChimp