return sale

__init__.py

@@ -31,6 +31,7 @@ def register():
         maintenance.ChangePropietaryMaintenance,
         move.Move,
         move.ShipmentOut,
+        move.ShipmentOutReturn,
         move.ShipmentInternal,
         sale.Sale,
         sale.SaleLine,

move.py

@@ -208,3 +208,13 @@ class ShipmentInternal(metaclass=PoolMeta):
         Move.do([m for s in shipments for m in s.incoming_moves])
         cls.write([s for s in shipments if not s.effective_date], {
                 'effective_date': Date.today(),})
+
+
+class ShipmentOutReturn(metaclass=PoolMeta):
+    "Customer Shipment Return"
+    __name__ = 'stock.shipment.out.return'
+
+    service_maintenance_initial = fields.Boolean('Maintenance Initial', states={'readonly': True})
+    sale_type = fields.Char('Type sale origin')
+    
+ 

sale.py

@@ -112,6 +112,23 @@ class Sale(metaclass=PoolMeta):
 
         return Shipment(**values)
 
+    @classmethod
+    def copy(cls, sales, default=None):
+        if default is None:
+            default = {}
+        else:
+            default = default.copy()
+
+        default.setdefault('number', None)
+        default.setdefault('invoice_state', 'none')
+        default.setdefault('invoices_ignored', None)
+        default.setdefault('moves', None)
+        default.setdefault('shipment_state', 'none')
+        default.setdefault('quoted_by')
+        default.setdefault('confirmed_by')
+
+        return super(Sale, cls).copy(sales, default=default)
+
     @classmethod
     @ModelView.button
     @Workflow.transition('quotation')