Fields are not defined as DCR field types Included in Data Change Requests as Data Change Request Lines. Why is this?
Data Change Requests (DCRs) can have a type of New or Edit. New DCRs are for adding accounts, addresses, or child account records.
For Data Change Requests (DCRs) that are New, fields that are not defined in DCR Field Types can be included as Data Change Request Lines (DCR Lines) to retain information on the record when it is created in CRM.
CRM Help Documentation: Data Change Requests Overview