Index: branches/version-2_12-dev/data/class/helper/SC_Helper_DB.php
===================================================================
--- branches/version-2_12-dev/data/class/helper/SC_Helper_DB.php	(revision 21897)
+++ branches/version-2_12-dev/data/class/helper/SC_Helper_DB.php	(revision 21898)
@@ -1401,5 +1401,5 @@
 
         $objQuery =& SC_Query_Ex::getSingletonInstance();
-        $where = 'product_id = ? AND del_flg = 0 AND (classcategory_id1 > 0 OR classcategory_id2 > 0)';
+        $where = 'product_id = ? AND del_flg = 0 AND (classcategory_id1 != 0 OR classcategory_id2 != 0)';
         $exists = $objQuery->exists('dtb_products_class', $where, array($product_id));