diff --git a/addons/point_of_sale/report/pos_details.py b/addons/point_of_sale/report/pos_details.py
index 48f43a78d99..18546c89bbc 100644
--- a/addons/point_of_sale/report/pos_details.py
+++ b/addons/point_of_sale/report/pos_details.py
@@ -88,7 +88,7 @@ class pos_details(report_sxw.rml_parse):
     def _paid_total_2(self):
         return self.total or 0.0
 
-    def _get_sum_dis_2(self,form):
+    def _get_sum_dis_2(self):
         return self.discount or 0.0
 
     def _get_sum_discount(self, objects):
diff --git a/addons/point_of_sale/report/pos_details.rml b/addons/point_of_sale/report/pos_details.rml
index 3402c7b6a91..027d7aec27e 100644
--- a/addons/point_of_sale/report/pos_details.rml
+++ b/addons/point_of_sale/report/pos_details.rml
@@ -373,7 +373,7 @@
           <para style="terp_default_Bold_9">Total discount</para>
         </td>
         <td>
-          <para style="terp_default_Right_9_Bold">[[ formatLang(getsumdisc(data['form']), dp='Sale Price') ]] [[ company.currency_id.symbol ]]</para>
+          <para style="terp_default_Right_9_Bold">[[ formatLang(getsumdisc(), dp='Sale Price') ]] [[ company.currency_id.symbol ]]</para>
         </td>
       </tr>
       <tr>