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In a multi OMS environment (3 nodes) i know that the patch needs to be applied in the primary Weblogic server.
Does it also need to be applied in the other OMS nodes?
Yes, it needs to be applied in all the nodes. Please also note that WL PSU (released from October 20) is expecting FME 126.96.36.199 so upgrade the utility if you're running on previous version.