You can set preferences for Remote System to handle differing Remote Systems and missing Remote System.
Projects that reference Remote Systems contain an internal cache of the referenced Remote Systems. When such projects are imported in the workspace, the Remote Systems in the cache may differ from the actual Remote Systems in the workspace or be missing entirely.
To configure merge settings:
The Preferences dialog appears.
You can configure the way the dialog appears by changing the Remote System Project Cache page as shown in the above figure.
You have set the preferences for Remote System to handle differing Remote Systems and missing Remote Systems.