diff --git a/sale.py b/sale.py
index ff385ae82c..9c18fb3aef 100644
--- a/sale.py
+++ b/sale.py
@@ -6,14 +6,15 @@ from trytond.model import fields
 from trytond.pool import PoolMeta, Pool
 from trytond.pyson import Eval
 
+from trytond.modules.currency.fields import Monetary
 from trytond.modules.product import price_digits, round_price
 
 
 class Line(metaclass=PoolMeta):
     __name__ = 'sale.line'
 
-    base_price = fields.Numeric(
-        "Base Price", digits=price_digits,
+    base_price = Monetary(
+        "Base Price", currency='currency', digits=price_digits,
         states={
             'invisible': Eval('type') != 'line',
             'readonly': Eval('sale_state') != 'draft',
@@ -28,8 +29,8 @@ class Line(metaclass=PoolMeta):
                 },
             depends=['type', 'sale_state']),
         'on_change_with_discount_rate', setter='set_discount_rate')
-    discount_amount = fields.Function(fields.Numeric(
-            "Discount Amount", digits=price_digits,
+    discount_amount = fields.Function(Monetary(
+            "Discount Amount", currency='currency', digits=price_digits,
             states={
                 'invisible': Eval('type') != 'line',
                 'readonly': Eval('sale_state') != 'draft',
diff --git a/view/sale_line_form.xml b/view/sale_line_form.xml
index 54226d3116..cf3bff67db 100644
--- a/view/sale_line_form.xml
+++ b/view/sale_line_form.xml
@@ -4,14 +4,14 @@ this repository contains the full copyright notices and license terms. -->
 <data>
     <xpath expr="//label[@name='unit_price']" position="before">
         <label name="base_price"/>
-        <field name="base_price" symbol="currency"/>
+        <field name="base_price"/>
         <label id="discount" string="Discount"/>
         <group col="-1" id="discounts">
             <group col="-1" id="discount_rate">
                 <field name="discount_rate" factor="100" xexpand="0"/>
                 <label name="discount_rate" string="%" xalign="0.0" xexpand="1"/>
             </group>
-            <field name="discount_amount" symbol="currency"/>
+            <field name="discount_amount"/>
         </group>
     </xpath>
 </data>
diff --git a/view/sale_line_list.xml b/view/sale_line_list.xml
index 1e6ef2008d..b512aa9df3 100644
--- a/view/sale_line_list.xml
+++ b/view/sale_line_list.xml
@@ -3,10 +3,10 @@
 this repository contains the full copyright notices and license terms. -->
 <data>
     <xpath expr="//field[@name='unit_price']" position="before">
-        <field name="base_price" symbol="currency"/>
+        <field name="base_price"/>
         <field name="discount_rate" factor="100">
             <suffix name="discount_rate" string="%"/>
         </field>
-        <field name="discount_amount" symbol="currency"/>
+        <field name="discount_amount"/>
     </xpath>
 </data>