In addition to any Custom Areas of Use set up by users, there are also the standard Area of Use Definitions contained within the Datasource. You can control whether both of these types of Areas of Use are applied via the checkboxes in the Area of Use group of the Administrative Settings Filtering tab.
By default, datasource Areas of Use will be ignored when selecting Coordinate Systems (for example, in an Interactive Job you will only be limited by the custom Areas of Use when selecting a coordinate system).
If the Coordinate Systems checkbox under Ignore datasource areas of uses when selecting is unchecked, then you will only be able to select coordinate systems that have areas of use that contain the coordinate specified in the Coordinate Point Definition fields.
Similar logic applies to the other listed datatypes.