Index: trunk/core/kernel/db/dblist.php
===================================================================
diff -u -N -r7391 -r7635
--- trunk/core/kernel/db/dblist.php	(.../dblist.php)	(revision 7391)
+++ trunk/core/kernel/db/dblist.php	(.../dblist.php)	(revision 7635)
@@ -560,21 +560,22 @@
 	* @access public
 	* @param string $field Field name
 	* @param string $direction Direction of ordering (asc|desc)
+	* @param bool $is_expression this is expression, that should not be escapted by "`" symbols
 	* @return void
 	*/
-	function AddOrderField($field, $direction)
+	function AddOrderField($field, $direction = 'asc', $is_expression = false)
 	{
 		// original multilanguage field - convert to current lang field
 		if (getArrayValue($this->Fields, $field, 'formatter') == 'kMultiLanguage' && !getArrayValue($this->Fields, $field, 'master_field')) {
 			$lang = $this->Application->GetVar('m_lang');
 			$field = 'l'.$lang.'_'.$field;
 		}
 
-		if (!isset($this->Fields[$field]) && ($field != 'RAND()')) {
+		if (!isset($this->Fields[$field]) && $field != 'RAND()' && !$is_expression) {
 			trigger_error('<span class="debug_error">Incorrect sorting</span> defined (field = <b>'.$field.'</b>; direction = <b>'.$direction.'</b>) in config for prefix <b>'.$this->Prefix.'</b>', E_USER_WARNING);
 		}
 
-		$this->OrderFields[] = Array($field, $direction);
+		$this->OrderFields[] = Array($field, $direction, $is_expression);
 	}
 
 	/**
@@ -603,7 +604,8 @@
 
 			$name = $field[0];
 			$ret .= isset($this->Fields[$name]) && !isset($this->VirtualFields[$name]) ? '`'.$this->TableName.'`.' : '';
-			if ($field[0] == 'RAND()') {
+			
+			if ($field[0] == 'RAND()' || $field[2]) {
 				$ret .= $field[0].' '.$field[1].',';
 			}
 			else {