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Your log in details don't work?
Im sure I've logged into ebay.com with my ebay.co.uk details so might work the same?
When you say "...but when I click on it.." where are you clicking on the dispute from?
If you are clicking on it in the resolution centre while logged in and it's asking you to sign into german ebay and you can't get any further then I'd contact ebay customer services. I've used the live chat and the call back thing for a few problems and always found them pretty helpful.
They have opened a dispute but when i click on it, it just takes me to the login for German ebay so i can't respond??