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Where-Used List for Installed Base
Components 
You can call a where-used list in the structure display for components of type Product and Individual Object. You can use the where-used list function to check in which other installed bases a product or individual object is installed or used to be installed at an earlier point in time.
If you want to access the where-used list, you have two options:
· Right mouse click on an installed base component in the structure display of the installed base and then choose the entry Product Application 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.
Select the relevant component in the structure display of the installed base and choose Where-Used List.