Where-Used List for IBase Components (SAP Easy Access) 
You can call a where-used list in the structure display for components of type product and object. You can use the where-used list to check in which other installed bases the product or object is located, or where it was at an earlier point in time.
This function is available on the SAP Easy Access screen in installed base processing.
Activities
You can view the where-used list using one of the following methods:
Right-click on an installed base component in the structure display of the installed base and then choose Product Usage or Object Usage from the dialog box displayed. The entry displayed depends on the component type.
Select the relevant component in the structure display of the installed base and choose
Environment 
Component Usage 
.