Pathauto is starting to prevent users from creating aliases that conflict with existing system aliases (callbacks). When it does this Pathauto will output a message: "Ignoring alias {alias_name} due to existing path conflict"

There are times, however, when you may want to create the alias anyway. In order to do so you will have to create the alias manually using the path module (core module in Drupal 4.3 and up).

The standard way to do this is the same way that you would do it for all other paths: in administer > url aliases.

For nodes, this can be achieved in a second way: in the node itself using the URL Path setting of the node.

For more information on manually creating aliases read the Path Module Documentation.