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LIBREF, DSN, VAR_NM, VAR_TYPE, VAR_LEN, VAR_LOGIC and ACTIVE are NOT NULL in the table definition, so the requirement is stated once, in the model, instead of being repeated as NOTNULL rules in MPE_VALIDATIONS for each column. VAR_FMT stays nullable: it is optional on a derived variable, and its HARDREGEX already accepts an empty value. The seven NOTNULL rule inserts are removed from the 7.19 migration, and the comment on ACTIVE no longer describes a rule that is not there.