Good morning Ervin,
Thank you very much for your answer. I had a suspicion that the error was deeper in the belly of the system and not caused by DTR.
In the note you mention, it says that a new version of Oracle Client software will be delivered, which should fix the error, but do you have an idea on when it will be available for SAP customers to download?
Just as a temporary workaround I've replaced the ojdbc6.jar for 11.2.0.4 with the one from 11.2.0.3 and I'm now able to access and browse the DTR.
Best regards,
Jacob