Unexpected Error Handler warning is issued in the following situations:
'Abort Transaction' should be set to 'Yes' for 'AllException' error handler at screen flow level
You have an Error Handler in a Screen Flow to catch general exceptions and the Abort Transaction property is set to 'No'.
You should change the Abort Transaction property to 'Yes' because, since the Error Handler is catching all exceptions, the current database transactions should be aborted to avoid committing inconsistent data.
Double-click on the error line to take you directly to the Error Handler element in your flow.