diff --git a/shipment.py b/shipment.py
index bee40e80f4..5bf46c3058 100644
--- a/shipment.py
+++ b/shipment.py
@@ -8,6 +8,7 @@ from itertools import groupby
 
 from sql import Null
 from sql.conditionals import Coalesce
+from sql.functions import CharLength
 
 from trytond.i18n import gettext
 from trytond.model import ModelSQL, ModelView, Workflow, dualmethod, fields
@@ -288,6 +289,11 @@ class ShipmentIn(ShipmentMixin, Workflow, ModelSQL, ModelView):
                 [sql_table.state], ['cancelled'],
                 where=sql_table.state == 'cancel'))
 
+    @classmethod
+    def order_number(cls, tables):
+        table, _ = tables[None]
+        return [CharLength(table.number), table.number]
+
     @classmethod
     def order_effective_date(cls, tables):
         table, _ = tables[None]
@@ -724,6 +730,11 @@ class ShipmentInReturn(ShipmentAssignMixin, Workflow, ModelSQL, ModelView):
                 [sql_table.state], ['cancelled'],
                 where=sql_table.state == 'cancel'))
 
+    @classmethod
+    def order_number(cls, tables):
+        table, _ = tables[None]
+        return [CharLength(table.number), table.number]
+
     @classmethod
     def order_effective_date(cls, tables):
         table, _ = tables[None]
@@ -1158,6 +1169,11 @@ class ShipmentOut(ShipmentAssignMixin, Workflow, ModelSQL, ModelView):
                 [sql_table.state], ['cancelled'],
                 where=sql_table.state == 'cancel'))
 
+    @classmethod
+    def order_number(cls, tables):
+        table, _ = tables[None]
+        return [CharLength(table.number), table.number]
+
     @classmethod
     def order_effective_date(cls, tables):
         table, _ = tables[None]
@@ -1770,6 +1786,11 @@ class ShipmentOutReturn(ShipmentMixin, Workflow, ModelSQL, ModelView):
         # Migration from 6.4: remove required on contact_address
         table.not_null_action('contact_address', 'remove')
 
+    @classmethod
+    def order_number(cls, tables):
+        table, _ = tables[None]
+        return [CharLength(table.number), table.number]
+
     @classmethod
     def order_effective_date(cls, tables):
         table, _ = tables[None]
@@ -2290,6 +2311,11 @@ class ShipmentInternal(ShipmentAssignMixin, Workflow, ModelSQL, ModelView):
                 [sql_table.state], ['cancelled'],
                 where=sql_table.state == 'cancel'))
 
+    @classmethod
+    def order_number(cls, tables):
+        table, _ = tables[None]
+        return [CharLength(table.number), table.number]
+
     @classmethod
     def order_effective_date(cls, tables):
         table, _ = tables[None]