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Additional information may be placed in COREF (e.g., CRF page number or name) to further describe the comment's relationship to the parent record.
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As with Supplemental Qualifiers (SUPP--) and Related Records (RELREC), --GRPID and other grouping variables can be used as the value in IDVAR to identify comments with relationships to multiple domain records. The limitation of this is that a single comment may only be related to a group of records in 1 domain (RDOMAIN can have only 1 value). If a single comment relates to records in multiple domains, the comment may need to be repeated in the CO special-purpose domain to facilitate the understanding of the relationships.
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