If a library has an attribute that is both repeatable and mandatory, they can't delete one of the attribute values if it's no longer needed. For instance, a library may have a 'Parent/guardian' attribute, and a patron could have it repeated to list two parents/guardians - but then if one of the guardians should be removed, the second instance of the attribute can't be deleted. To recreate: -Create an attribute that is mandatory and repeatable -Add the attribute twice to a patron record, and save -Open the patron record for editing, and clear the data from the second instance of the attribute -Note that the second instance can't be deleted, and the patron record can't be saved with that attribute empty