diff --git a/bin/addons/base/ir/ir_actions.py b/bin/addons/base/ir/ir_actions.py
index 84419d25b51..807d0438b82 100644
--- a/bin/addons/base/ir/ir_actions.py
+++ b/bin/addons/base/ir/ir_actions.py
@@ -151,8 +151,12 @@ class act_window(osv.osv):
             if action.src_model and not self.pool.get(action.src_model):
                 return False
         return True
+
+    def _invalid_model_msg(self, cr, uid, ids, context=None):
+        return _('Invalid model name in the action definition.')
+    
     _constraints = [
-        (_check_model, 'Invalid model name in the action definition.', ['res_model','src_model'])
+        (_check_model, _invalid_model_msg, ['res_model','src_model'])
     ]
 
     def _views_get_fnc(self, cr, uid, ids, name, arg, context={}):
diff --git a/bin/addons/base/ir/ir_model.py b/bin/addons/base/ir/ir_model.py
index 3f3700b0e45..5f9e3347b74 100644
--- a/bin/addons/base/ir/ir_model.py
+++ b/bin/addons/base/ir/ir_model.py
@@ -88,8 +88,10 @@ class ir_model(osv.osv):
                 return False
         return True
 
+    def _model_name_msg(self, cr, uid, ids, context=None):
+        return _('The Object name must start with x_ and not contain any special character !')
     _constraints = [
-        (_check_model_name, 'The Object name must start with x_ and not contain any special character !', ['model']),
+        (_check_model_name, _model_name_msg, ['model']),
     ]
 
     # overridden to allow searching both on model name (model field)
@@ -181,8 +183,11 @@ class ir_model_fields(osv.osv):
         'selectable': lambda *a: 1,
     }
     _order = "id"
+    def _size_gt_zero_msg(self, cr, user, ids, context=None):
+        return _('Size of the field can never be less than 1 !')
+
     _sql_constraints = [
-        ('size_gt_zero', 'CHECK (size>0)', 'Size of the field can never be less than 1 !'),
+        ('size_gt_zero', 'CHECK (size>0)',_size_gt_zero_msg ),
     ]
     def unlink(self, cr, user, ids, context=None):
         for field in self.browse(cr, user, ids, context):
diff --git a/bin/addons/base/ir/ir_ui_menu.py b/bin/addons/base/ir/ir_ui_menu.py
index f79493b4813..81dd5bef4d7 100644
--- a/bin/addons/base/ir/ir_ui_menu.py
+++ b/bin/addons/base/ir/ir_ui_menu.py
@@ -22,6 +22,7 @@
 from osv import fields, osv
 import re
 import tools
+from tools.translate import _
 
 def one_in(setA, setB):
     """Check the presence of an element of setA in setB
@@ -285,8 +286,12 @@ class ir_ui_menu(osv.osv):
                 ('ir.actions.server', 'ir.actions.server'),
             ]),
     }
+    
+    def _rec_message(self, cr, uid, ids, context=None):
+        return _('Error ! You can not create recursive Menu.')
+
     _constraints = [
-        (_check_recursion, 'Error ! You can not create recursive Menu.', ['parent_id'])
+        (_check_recursion, _rec_message , ['parent_id'])
     ]
     _defaults = {
         'icon' : lambda *a: 'STOCK_OPEN',
diff --git a/bin/addons/base/module/module.py b/bin/addons/base/module/module.py
index 81985332157..f392ee51326 100644
--- a/bin/addons/base/module/module.py
+++ b/bin/addons/base/module/module.py
@@ -187,9 +187,14 @@ class module(osv.osv):
     }
     _order = 'name'
 
+    def _name_uniq_msg(self, cr, uid, ids, context=None):
+        return _('The name of the module must be unique !')
+    def _certificate_uniq_msg(self, cr, uid, ids, context=None):
+        return _('The certificate ID of the module must be unique !')
+
     _sql_constraints = [
-        ('name_uniq', 'unique (name)', 'The name of the module must be unique !'),
-        ('certificate_uniq', 'unique (certificate)', 'The certificate ID of the module must be unique !')
+        ('name_uniq', 'UNIQUE (name)',_name_uniq_msg ),
+        ('certificate_uniq', 'UNIQUE (certificate)',_certificate_uniq_msg )
     ]
 
     def unlink(self, cr, uid, ids, context=None):
diff --git a/bin/osv/orm.py b/bin/osv/orm.py
index 5cf0e08a02e..e168146b595 100644
--- a/bin/osv/orm.py
+++ b/bin/osv/orm.py
@@ -1053,9 +1053,14 @@ class orm_template(object):
                 # Check presence of __call__ directly instead of using
                 # callable() because it will be deprecated as of Python 3.0
                 if hasattr(msg, '__call__'):
-                    txt_msg, params = msg(self, cr, uid, ids)
-                    tmp_msg = trans._get_source(cr, uid, self._name, 'constraint', lng, source=txt_msg) or txt_msg
-                    translated_msg = tmp_msg % params
+                    tmp_msg = msg(self, cr, uid, ids, context=context)
+                    # Why translate something that has been generated dynamically?
+                    # tmp_msg = trans._get_source(cr, uid, self._name, 'constraint', lng, source=txt_msg) or txt_msg
+                    if isinstance(tmp_msg, tuple):
+                        tmp_msg, params = tmp_msg
+                        translated_msg = tmp_msg % params
+                    else:
+                        translated_msg = tmp_msg
                 else:
                     translated_msg = trans._get_source(cr, uid, self._name, 'constraint', lng, source=msg) or msg
                 error_msgs.append(