System-Defined Fields

System-defined fields are used to record data that the application needs in order to function properly, and as such, they are only partially customizable by users. Unlike user-defined fields, you cannot define where in the database system-defined fields are located, the name or display type for the fields, or what kind of data they can track. However, for most system-defined fields, you can customize what values are available in the field and, for the Phone Types field, you can customize the names and add more fields.