diff --git a/sale.py b/sale.py
index abd657f61d..aa23dbcbe2 100644
--- a/sale.py
+++ b/sale.py
@@ -1245,6 +1245,9 @@ class SaleLine(ModelSQL, ModelView):
                 self._get_context_sale_price(product,vals)):
             res['unit_price'] = product_obj.get_sale_price([product.id],
                     vals.get('quantity', 0))[product.id]
+            if res['unit_price']:
+                res['unit_price'] = res['unit_price'].quantize(
+                    Decimal(1) / 10 ** self.unit_price.digits[1])
         res['taxes'] = []
         pattern = self._get_tax_rule_pattern(party, vals)
         for tax in product.customer_taxes_used:
@@ -1291,6 +1294,9 @@ class SaleLine(ModelSQL, ModelView):
                 self._get_context_sale_price(product, vals)):
             res['unit_price'] = product_obj.get_sale_price([vals['product']],
                     vals.get('quantity', 0))[vals['product']]
+            if res['unit_price']:
+                res['unit_price'] = res['unit_price'].quantize(
+                    Decimal(1) / 10 ** self.unit_price.digits[1])
         return res
 
     def on_change_unit(self, vals):
@@ -1615,7 +1621,7 @@ class Product(ModelSQL, ModelView):
                     with Transaction().set_context(date=date):
                         res[product.id] = currency_obj.compute(
                                 user2.company.currency.id, res[product.id],
-                                currency.id)
+                                currency.id, round=False)
         return res
 
     def compute_delivery_date(self, product, date=None):