diff --git a/sale.py b/sale.py
index 96f61c0..a89ac27 100644
--- a/sale.py
+++ b/sale.py
@@ -56,7 +56,7 @@ class Sale(metaclass=PoolMeta):
         cls._buttons.update({
             'draft': {
                 'invisible': (Eval('state').in_(
-                    ['cancelled', 'draft'])) | (Eval('shipment_state') == 'sent')},
+                    ['cancelled', 'draft']))},
             'report': {}})
         
         cls._transitions |= set((