Use tryton.cfg to register in the Pool

modules/stock_shipment_cost_weight/__init__.py

@@ -1,16 +1,2 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-
-from trytond.pool import Pool
-
-from . import carrier, stock
-
-__all__ = ['register']
-
-
-def register():
-    Pool.register(
-        carrier.Carrier,
-        stock.ShipmentOut,
-        stock.ShipmentOutReturn,
-        module='stock_shipment_cost_weight', type_='model')

modules/stock_shipment_cost_weight/tryton.cfg

@@ -5,3 +5,9 @@ depends:
     ir
     stock_shipment_cost
     stock_shipment_measurements
+
+[register]
+model:
+    carrier.Carrier
+    stock.ShipmentOut
+    stock.ShipmentOutReturn