User is trying to rename an account in Chart of Accounts to fix a spelling error, but cannot do so and gets the following error message:
You cannot change the details of system accounts.
This happens if you try to rename an account that is set as a default system account in Global Settings > Accounting > System Accounts. If you want to rename the account, you can temporarily remove it as a system account in Global Settings and put another account in its place. After you make the correction, you can set it back as the system account. Check out this article for more details: Editing system accounts in Core.