diff --git a/account.py b/account.py
index 0df3d1c1ea..233c5c2b1c 100644
--- a/account.py
+++ b/account.py
@@ -8,7 +8,7 @@ from functools import wraps
 
 from sql import Column, Literal, Null
 from sql.aggregate import Sum
-from sql.conditionals import Coalesce
+from sql.conditionals import Coalesce, Case
 
 from trytond.model import ModelView, ModelSQL, fields, Unique
 from trytond.wizard import Wizard, StateView, StateAction, StateTransition, \
@@ -80,7 +80,7 @@ class TypeTemplate(ModelSQL, ModelView):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
 
     @staticmethod
     def default_balance_sheet():
@@ -223,7 +223,7 @@ class Type(ModelSQL, ModelView):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
 
     @staticmethod
     def default_balance_sheet():
diff --git a/journal.py b/journal.py
index f90a4fbba5..0e3a9eb53a 100644
--- a/journal.py
+++ b/journal.py
@@ -1,6 +1,7 @@
 # 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 sql import Null
+from sql.conditionals import Case
 
 from trytond.model import ModelView, ModelSQL, fields, Unique
 from trytond.wizard import Wizard, StateTransition
@@ -81,7 +82,7 @@ class JournalViewColumn(ModelSQL, ModelView):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
 
     @staticmethod
     def default_required():
diff --git a/move_template.py b/move_template.py
index 8e0883221e..87e846ba7f 100644
--- a/move_template.py
+++ b/move_template.py
@@ -5,6 +5,7 @@ from decimal import Decimal
 
 from simpleeval import simple_eval
 from sql import Null
+from sql.conditionals import Case
 
 from trytond.model import ModelSQL, ModelView, fields
 from trytond.pyson import Eval
@@ -92,7 +93,7 @@ class MoveTemplateKeyword(ModelSQL, ModelView):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
 
     @staticmethod
     def default_required():
diff --git a/tax.py b/tax.py
index a4cee65b87..db3e3a03f9 100644
--- a/tax.py
+++ b/tax.py
@@ -3,10 +3,11 @@
 import datetime
 from collections import namedtuple
 from decimal import Decimal
+from itertools import groupby
 
 from sql import Null
 from sql.aggregate import Sum
-from itertools import groupby
+from sql.conditionals import Case
 
 from trytond.model import ModelView, ModelSQL, MatchMixin, fields
 from trytond.wizard import Wizard, StateView, StateAction, Button
@@ -448,7 +449,7 @@ class TaxTemplate(ModelSQL, ModelView):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
 
     @staticmethod
     def default_type():
@@ -770,7 +771,7 @@ class Tax(ModelSQL, ModelView):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
 
     @staticmethod
     def default_active():
@@ -1409,7 +1410,7 @@ class TaxRuleLineTemplate(ModelSQL, ModelView):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
 
     def _get_tax_rule_line_value(self, rule_line=None):
         '''
@@ -1523,7 +1524,7 @@ class TaxRuleLine(ModelSQL, ModelView, MatchMixin):
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
 
     def match(self, pattern):
         if 'group' in pattern and not self.group: