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What are you trying to do?
The issue looks like it has been fixed in Windchill 12 and later. Windchill 11.0 end-of-life was at least 4 years ago!
My client is currently using Windchill 11.0 and has encountered this problem. How can I solve this problem?
Have you already tried to search the KB with your error?
https://www.ptc.com/en/support/search/#q=Version%20already%20exists%2C%20cannot%20create%20a%20duplicate
