text: SET DEFINE OFF;
  ALTER TABLE AFW_12_STAT ADD (
    CONSTRAINT AFW_12_STAT_CK2
    CHECK (
    dnr_ref_domn is not null and dnr_ref_prodt is null
    or
    dnr_ref_domn is null and dnr_ref_prodt is not null
  )
    ENABLE VALIDATE)
  /
  