Okay, so one of my colleagues found the issue, and after that, I realized what happened. There was a missing 'BoschRexroth_IndraDrive_ECAT_SoE_01V18.XML' from the 'C:\TwinCAT\3.1\Config\Io\EtherCAT folder', but it was hard to find, since the error message didn't showed, which fsoe was faulty. After many manual search, I found, that the subtype 792 and vendor 36 meant Bosch Rexroth IndraDrive, and that's how he found the missing xml. It was missing, because of a recent issue with other projects, I deleted 2 of these xml's: one was v18, other one was v27. These had version conflicts, and it was not clear for me, which one was faulty, so I deleted both. Right now it's clear, that one of these has to be there (sadly the older projects are not compatible with the newer versions, so this will be an issue in our server). This topic tells more about this: https://community.developer.bosch.com/t5/Knowledge-base/TwinSAFE-4020-error-Multiple-definitions-exist-for-the/ta-p/46781
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