Fix: Add buttons with error

tests/scenario_sale_order.rst

@@ -34,7 +34,6 @@ Create order::
   >>> order = SaleOrder()
   >>> order.party = party
   >>> order.pickup_location = "on_site"
-  >>> order.save()
   >>> line1 = order.lines.new()
   >>> line1.product = product
   >>> line1.unit = unit
@@ -43,6 +42,10 @@ Create order::
   >>> line1.total_amount = Decimal('33600')
   >>> order.total_order = Decimal('33600')
   >>> order.save()
-
-
-  
+  >>> order.state
+  'draft'
+  >>> order.click('confirm')
+  >>> order.state
+  'confirmed'
+  >>> order.number
+  'SO00001'