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The Supplemental Qualifiers (SUPP--) special purpose dataset model is used to represent both nonstandard variables (NSVs) and attributions with their relationship to records in a parent dataset. SUPP-- will only be used with general observation class  

There will be only one SUPP-- dataset for a parent dataset. Relationships between records in the SUPP-- dataset and observations in the parent dataset are specified using the key variables STUDYID, RDOMAIN (the domain code of the observation in the relationship), USUBJID or POOLID (for nonclinical studies only), along with IDVAR (the variable that identifies the related observation) and IDVARVAL (the value of the identifying variable). IDVARVAL will contain the value of the variable described in IDVAR. Single records can be related by using a unique-record-identifier variable such as --SEQ in IDVAR. Groups of records can be related by using grouping variables such as --GRPID in IDVAR. Using --GRPID can be a more efficient method of representing relationships when relating an NSV or attribution to a group of observations in the parent dataset. 

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