Index: trunk/core/kernel/db/dbitem.php
===================================================================
diff -u -N -r8563 -r8719
--- trunk/core/kernel/db/dbitem.php	(.../dbitem.php)	(revision 8563)
+++ trunk/core/kernel/db/dbitem.php	(.../dbitem.php)	(revision 8719)
@@ -83,6 +83,16 @@
 	}
 
 	/**
+	 * Sets original field value (useful for custom virtual fields)
+	 *
+	 * @param string $field_name
+	 */
+	function SetOriginalField($field_name, $field_value)
+	{
+		$this->OriginalFieldValues[$field_name] = $field_value;
+	}
+
+	/**
 	 * Set's default values for all fields
 	 *
 	 * @param bool $populate_ml_fields create all ml fields from db in config or not