Index: /model/wpsg_product.class.php
===================================================================
--- /model/wpsg_product.class.php	(revision 8513)
+++ /model/wpsg_product.class.php	(revision 8514)
@@ -1395,5 +1395,6 @@
 			if (wpsg_isSizedString($arFilter['order'], 'name')) { $strQueryORDER = " P.`name` "; }
 			else if (wpsg_isSizedString($arFilter['order'], 'price')) { $strQueryORDER = " P.`preis` "; }
-            else if (wpsg_isSizedString($arFilter['order'], 'cdate')) { $strQueryORDER = " P.`cdate` "; }
+			else if (wpsg_isSizedString($arFilter['order'], 'cdate')) { $strQueryORDER = " P.`cdate` "; }
+			else if (wpsg_isSizedString($arFilter['order'], 'mwst')) { $strQueryORDER = " P.`mwst_key` "; }
 			else if (wpsg_isSizedString($arFilter['order'], 'anr')) { $strQueryORDER = " P.`anr` "; }
             else if (wpsg_isSizedString($arFilter['order'], 'pos')) { $strQueryORDER = " POST.`menu_order` "; $bJoinPost = true; }