Index: branches/version-2_13-dev/data/class/helper/SC_Helper_TaxRule.php
===================================================================
--- branches/version-2_13-dev/data/class/helper/SC_Helper_TaxRule.php	(revision 23463)
+++ branches/version-2_13-dev/data/class/helper/SC_Helper_TaxRule.php	(revision 23489)
@@ -105,5 +105,5 @@
         $real_tax = $tax / 100;
         $ret = $price * $real_tax;
-        $ret = SC_Helper_TaxRule_Ex::roundByCalcRule($ret, $calc_rule);
+        $ret = self::roundByCalcRule($ret, $calc_rule);
 
         return $ret + $tax_adjust;