diff --git a/models/sale_coupon_program.py b/models/sale_coupon_program.py
index 2419aa652ae..cd4ca0627b1 100644
--- a/models/sale_coupon_program.py
+++ b/models/sale_coupon_program.py
@@ -80,6 +80,11 @@ class SaleCouponProgram(models.Model):
         if self.promo_code_usage == 'no_code_needed':
             self.promo_code = False
 
+    @api.onchange('reward_product_id')
+    def _onchange_reward_product_id(self):
+        if self.reward_product_id:
+            self.reward_product_uom_id = self.reward_product_id.uom_id
+
     @api.model
     def create(self, vals):
         program = super(SaleCouponProgram, self).create(vals)
diff --git a/models/sale_order.py b/models/sale_order.py
index be5925fffe5..29b070c50c1 100644
--- a/models/sale_order.py
+++ b/models/sale_order.py
@@ -39,14 +39,12 @@ class SaleOrder(models.Model):
     @api.multi
     @api.returns('self', lambda value: value.id)
     def copy(self, default=None):
-        order = super(SaleOrder, self).copy(dict(default or {}, order_line=False))
-        for line in self._get_reward_lines():
-            line.copy({'order_id': order.id})
+        order = super(SaleOrder, self).copy(default)
+        order._get_reward_lines().unlink()
         order.with_context(sale_coupon_no_loop=False)._create_new_no_code_promo_reward_lines()
         return order
 
     def action_confirm(self):
-        self.recompute_coupon_lines()
         self.generated_coupon_ids.write({'state': 'new'})
         return super(SaleOrder, self).action_confirm()
 
diff --git a/tests/common.py b/tests/common.py
index 87f21a0d52a..03820578f64 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -25,17 +25,34 @@ class TestSaleCouponCommon(common.TransactionCase):
 
         self.uom_unit = self.env.ref('uom.product_uom_unit')
 
+        # Taxes
+        self.tax_15pc_excl = self.env['account.tax'].create({
+            'name': "Tax 15%",
+            'amount_type': 'percent',
+            'amount': 15,
+            'type_tax_use': 'sale',
+        })
+
+        self.tax_10pc_incl = self.env['account.tax'].create({
+            'name': "10% Tax incl",
+            'amount_type': 'percent',
+            'amount': 10,
+            'price_include': True,
+        })
+
         #products
         self.product_A = self.env['product.product'].create({
             'name': 'Product A',
             'list_price': 100,
-            'sale_ok': True
+            'sale_ok': True,
+            'taxes_id': [(6, 0, [self.tax_15pc_excl.id])],
         })
 
         self.product_B = self.env['product.product'].create({
             'name': 'Product B',
             'list_price': 5,
-            'sale_ok': True
+            'sale_ok': True,
+            'taxes_id': [(6, 0, [self.tax_15pc_excl.id])],
         })
 
         # Immediate Program By A + B: get B free
@@ -57,10 +74,3 @@ class TestSaleCouponCommon(common.TransactionCase):
             'rule_products_domain': "[('id', 'in', [%s])]" % (self.product_A.id),
             'active': True,
         })
-
-        self.tax_10pc_incl = self.env['account.tax'].create({
-            'name': "10% Tax incl",
-            'amount_type': 'percent',
-            'amount': 10,
-            'price_include': True,
-        })