This field contains the LSN Participant Accession Number(s) of a document that has a particular relationship to the document being entered. There are several types of relationships, such as: parent/child (a document and its attachments); original/subsequent (a document and a later version, comments, corrections, or errata); and whole/part (a book and its chapters, a journal and its articles); or an information package and the cataloging units it contains. The type of relationship is captured in the Related Record Code field.