Object Navigator 
The Object Navigator is a flexible display tool, which provides navigation help for complex object relations on an integrated user interface.
The objects involved can be related to each other across system boundaries. For individual roles, you can control access to objects and the composition of the relations involved.
In Customizing for the object navigator, you define Object Types, Relations between the object types, and Object-Type-Dependent Settings.
You define which relations are displayed in each view of an object type in the object navigator.
You define whether certain attributes are displayed in heterogeneous views (that is, views that contain different object types).
You can also define new object types (both SAP and non-SAP object types) and relations in Customizing.
The object navigator is, for example, implemented in SAP Product Lifecycle Management (SAP PLM) 7.0 on the SAP Product Lifecycle Management Web user interface (SAP PLM Web UI) for navigating between master data objects and their corresponding relations. For more information, see PLM-Specific Functions of the Object Navigator.
The starting point of the object navigator is the central object that you load in the object navigator. The system displays the objects that are related to the central object in the views of the object navigator. You can display a complex structure using the relations that you have defined for a view in the object navigator Customizing.
In the object navigator, you can do the following:
Display specific object data (attributes) for the central object and the related objects
Display relations between objects
Navigate along the breadcrumb trail
to related objects
to the central object
Navigate from the central object to related objects via Structure links
Navigate to the object-type-specific applications, such as the display or change modes
Note
When you navigate to the object-type-specific applications, you leave the object navigator and are taken to the corresponding object area.
In the Navigator Settings, you can influence the number of displayed objects by defining criteria for what is loaded. (See Settings for the Object Navigator.)
In the object navigator, you can only display data. You cannot change data.