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The Related Records (RELREC) special-purpose dataset is used to describe relationships between records for a subject and relationships between datasets.
Once confirmed, determine whether adding a variable from the SDTM will fit the need. If adding a variable from the SDTM meets the need, then a Supplemental Qualifier dataset will not be implemented. Supplemental Qualifier datasets will only be implemented for domains when data are not in scope for a variable defined in the SDTM.
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