Consider using EntityFieldQuery for the content queries to detect duplicate values. See:
http://api.drupal.org/api/drupal/includes--entity.inc/class/EntityFieldQ...

Comments

arithmetric’s picture

arithmetric commented
Status: Active » Fixed

This change is implemented here: http://drupalcode.org/project/unique_field.git/commit/6ba953f

Status: Fixed » Closed (fixed)

Automatically closed -- issue fixed for 2 weeks with no activity.