CalmUnique Fields
Some fields in Calm have been defined as unique fields, for example the RefNo and ObjectNumber fields in the Catalogue database. A unique field must contain data that is not duplicated in the same field in another record in the database. Calm will produce an error message if you try to save a record containing a unique field in which the data is not unique, if the validation options are set in Record drop down menu. You may not insert more than one version of a unique field into a record.