Indicating the Relevant Objects 
Use
You flag an object as relevant for Configuration Management if it plays an important role in the configuration of a product and you want to fix the processing status of the object in a Baseline.

For example, in the product "Turbine T-30" the configuration of the assembly "Pump P-100" has a decisive meaning. Therefore, you flag the material P-100 as relevant for Configuration Management.
For Baselining you use this indicator to determine whether the system:
Features
In Release 4.6C you can flag the objects of the following object types as relevant for Configuration Management:
See:
Maintaining the attributes relevant for Configuration ManagementIn Customizing the document types, you determine whether documents with a specific document type are relevant for Configuration Management. If you create a document info record, the system transfers the value of the relevancy indicator from the document type as the default value. You can assign this value in the document info record.

No indicator is needed for BOMs. When a material is flagged as relevant, the system automatically copies its BOM into the Baseline, provided it has a BOM whose usage is planned for the current life cycle phase (see: Determining the Structure Information about BOMs).