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Where-Used List for Specifications 
In the standard system, a where-used list is supplied with which you can determine specifications that contain the specifications selected in the hit list in one or more of the following ways:
· The selected specifications are contained in compositions or listings as components.
· The selected specifications are specified as references.
· The selected specifications are specified in the transport classification.

In the SAP component Recipe Management, a where-used list for specifications is also supplied. With this where-used list you can display the recipes that contain the selected specifications.
You can also define your own where-used lists in Customizing for Basic Data and Tools under Manage User Exits using user exits of the user exit category SUB_USAGE (where-used list in the hit list). If you specify a number of user exits for where-used lists for a specification category, a dialog box appears in the application in which a list of all where-used lists for the specification category is displayed. You can enter the following information:
· You can specify whether the where-used lists are linked logically with AND or OR.
· For each where-used list you can specify parameters on the basis of which the where-used list is executed, that is on the basis of which specifications are searched for.

You can only specify parameters for a number of where-used lists if these where-used lists provide specifications of one specification category only as the result.
If you have defined only one user exit for a specification category, a dialog box appears in the application in which you specify the parameters.
You can also include a where-used list for specifications as a search step in a query (see Creating a Specification Search Directly As a Query). The selection of individual specifications from the where-used list will be lost, however, meaning that the where-used list is run when the query is executed for all specifications in the hit list.
· Determining Usage As Components
· Determining Usage in Transport Classifications
· Determining Usage As References
