Can I change the user name after creating a user?

While both the Users tab of the Security Console and the Manage Users task permit you to change the user name, changing it isn't a good idea. Changing the user name requires extra setup for Oracle BI Answers.

Oracle BI Answers, the embedded reporting tool for building and modifying reports, creates a separate GUID from the user name when you create a user. If you change the user name, then you must update the BI Answers GUID by running the Rename Accounts Self-Service utility. You can download the utility from My Oracle Support article Oracle Fusion BI: Self-Service Forget Accounts and Rename Accounts Tools (Doc ID 2635720.1). If you used the user name in any script, then you must update that script as well.