diff --git a/trytond/trytond/tests/field_one2one.py b/trytond/trytond/tests/field_one2one.py
index 963bfd7e11..981fc9e1c9 100644
--- a/trytond/trytond/tests/field_one2one.py
+++ b/trytond/trytond/tests/field_one2one.py
@@ -30,9 +30,9 @@ class One2OneRelation(ModelSQL):
         table = cls.__table__()
         cls._sql_constraints += [
             ('origin_unique', Unique(table, table.origin),
-                'Origin must be unique'),
+                'tests.msg_one2one_relation_origin_unique'),
             ('target_unique', Unique(table, table.target),
-                'Target must be unique'),
+                'tests.msg_one2one_relation_target_unique'),
             ]
 
 
diff --git a/trytond/trytond/tests/message.xml b/trytond/trytond/tests/message.xml
index 3b5be09441..ad8405e283 100644
--- a/trytond/trytond/tests/message.xml
+++ b/trytond/trytond/tests/message.xml
@@ -6,5 +6,20 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.message" id="msg_test">
             <field name="text">Message</field>
         </record>
+        <record model="ir.message" id="msg_modelsql_check">
+            <field name="text">Value must be greater than 42.</field>
+        </record>
+        <record model="ir.message" id="msg_modelsql_unique">
+            <field name="text">Value must be unique.</field>
+        </record>
+        <record model="ir.message" id="msg_modelsql_exclude">
+            <field name="text">Value must be unique.</field>
+        </record>
+        <record model="ir.message" id="msg_one2one_relation_origin_unique">
+            <field name="text">Origin must be unique.</field>
+        </record>
+        <record model="ir.message" id="msg_one2one_relation_target_unique">
+            <field name="text">Target must be unique.</field>
+        </record>
     </data>
 </tryton>
diff --git a/trytond/trytond/tests/modelsql.py b/trytond/trytond/tests/modelsql.py
index dfda3a7fc1..8e6506af4b 100644
--- a/trytond/trytond/tests/modelsql.py
+++ b/trytond/trytond/tests/modelsql.py
@@ -184,8 +184,7 @@ class ModelCheck(ModelSQL):
         super(ModelCheck, cls).__setup__()
         t = cls.__table__()
         cls._sql_constraints = [
-            ('check', Check(t, (t.value > 42)),
-                "Value must be greater than 42."),
+            ('check', Check(t, (t.value > 42)), 'tests.msg_modelsql_check'),
             ]
 
 
@@ -199,7 +198,7 @@ class ModelUnique(ModelSQL):
         super(ModelUnique, cls).__setup__()
         t = cls.__table__()
         cls._sql_constraints = [
-            ('unique', Unique(t, t.value), "Value must be unique."),
+            ('unique', Unique(t, t.value), 'tests.msg_modelsql_unique'),
             ]
 
 
@@ -220,7 +219,7 @@ class ModelExclude(ModelSQL):
         cls._sql_constraints = [
             ('exclude', Exclude(t, (t.value, Equal),
                     where=t.condition == Literal(True)),
-                "Value must be unique."),
+                'tests.msg_modelsql_exclude'),
             ]