863-865 - Unpublished parts:

An Enumeration and Chronology field for a basic bibliographic unit (field 863) and supplementary material (field 864) may be used to record the enumeration and chronology for unpublished parts. In field 863 or 864, value 4 (Item(s) not published) in the second indicator position (form of holdings) indicates that the enumeration and chronology in the field represents unpublished parts. Subfield $w (Break indicator) May be attached to an 863 or 864 field that has value 4 in the second indicator position only in instances of consecutively input fields that contain information about unpublished parts and parts not in the holdings of the reporting organization. Example: