Custom fields are any fields that you choose to add to the application. They are also called user-defined fields. SAP delivers a standard set of fields with the application. Your company may require fields that are not part of the delivered set.
You can maintain your user-defined fields in the Customizing activity User-Defined Fields, under
.The application has the following features for maintaining user-defined fields:
Adding HR user-defined fields
Adding non-HR user-defined fields
Verifying user-defined fields
Maintaining user-defined fields in Web UI
Including user-defined fields in online reporting