diff --git a/CHANGELOG b/CHANGELOG
index 7b9164bb30..48d2e4a2c4 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+* Remove change_default on fields
+
 Version 2.2.0 - 2011-10-24
 * Bug fixes (see mercurial logs for details)
 * Remove name field in ir.property
diff --git a/doc/ref/models/fields.rst b/doc/ref/models/fields.rst
index ba7015dd45..f66c4a8539 100644
--- a/doc/ref/models/fields.rst
+++ b/doc/ref/models/fields.rst
@@ -65,13 +65,6 @@ one. Possible keys are ``required``, ``readonly`` and ``invisible``.
 The values are :class:`~trytond.pyson.PYSON` statements that will be evaluated
 with the values of the record.
 
-``change_default``
-------------------
-
-.. attribute:: Field.change_default
-
-If true, the field can be used as condition for a custom default value.
-
 ``select``
 ----------
 
diff --git a/trytond/model/fields/binary.py b/trytond/model/fields/binary.py
index bd06c04230..a7283030f9 100644
--- a/trytond/model/fields/binary.py
+++ b/trytond/model/fields/binary.py
@@ -12,9 +12,9 @@ class Binary(Field):
     _type = 'binary'
 
     def __init__(self, string='', help='', required=False, readonly=False,
-            domain=None, states=None, change_default=False, select=False,
-            on_change=None, on_change_with=None, depends=None, filename=None,
-            order_field=None, context=None, loading='lazy'):
+            domain=None, states=None, select=False, on_change=None,
+            on_change_with=None, depends=None, filename=None, order_field=None,
+            context=None, loading='lazy'):
         if filename is not None:
             self.filename = filename
             if depends is None:
@@ -23,9 +23,9 @@ class Binary(Field):
                 depends.append(filename)
         super(Binary, self).__init__(string=string, help=help,
             required=required, readonly=readonly, domain=domain, states=states,
-            change_default=change_default, select=select, on_change=on_change,
-            on_change_with=on_change_with, depends=depends,
-            order_field=order_field, context=context, loading=loading)
+            select=select, on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
 
     @staticmethod
     def get(ids, model, name, values=None):
diff --git a/trytond/model/fields/boolean.py b/trytond/model/fields/boolean.py
index e7bbd4dc86..7e785f99c2 100644
--- a/trytond/model/fields/boolean.py
+++ b/trytond/model/fields/boolean.py
@@ -11,14 +11,12 @@ class Boolean(Field):
     _type = 'boolean'
 
     def __init__(self, string='', help='', readonly=False, domain=None,
-            states=None, change_default=False, select=False, on_change=None,
-            on_change_with=None, depends=None, order_field=None, context=None,
-            loading='eager'):
+            states=None, select=False, on_change=None, on_change_with=None,
+            depends=None, order_field=None, context=None, loading='eager'):
         super(Boolean, self).__init__(string=string, help=help, required=False,
-                readonly=readonly, domain=domain, states=states,
-                change_default=change_default, select=select,
-                on_change=on_change, on_change_with=on_change_with,
-                depends=depends, order_field=order_field, context=context,
-                loading=loading)
+            readonly=readonly, domain=domain, states=states, select=select,
+            on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
 
     __init__.__doc__ = Field.__init__.__doc__
diff --git a/trytond/model/fields/char.py b/trytond/model/fields/char.py
index 593d61b5a2..7b352682ba 100644
--- a/trytond/model/fields/char.py
+++ b/trytond/model/fields/char.py
@@ -15,20 +15,19 @@ class Char(Field):
     _type = 'char'
 
     def __init__(self, string='', size=None, help='', required=False,
-            readonly=False, domain=None, states=None, change_default=False,
-            translate=False, select=False, on_change=None, on_change_with=None,
-            depends=None, order_field=None, context=None, loading='eager',
+            readonly=False, domain=None, states=None, translate=False,
+            select=False, on_change=None, on_change_with=None, depends=None,
+            order_field=None, context=None, loading='eager',
             autocomplete=None):
         '''
         :param translate: A boolean. If ``True`` the field is translatable.
         :param size: A integer. If set defines the maximum size of the values.
         '''
         super(Char, self).__init__(string=string, help=help, required=required,
-                readonly=readonly, domain=domain, states=states,
-                change_default=change_default, select=select,
-                on_change=on_change, on_change_with=on_change_with,
-                depends=depends, order_field=order_field, context=context,
-                loading=loading)
+            readonly=readonly, domain=domain, states=states, select=select,
+            on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
         self.__autocomplete = None
         self.autocomplete = autocomplete if autocomplete else None
         self.translate = translate
diff --git a/trytond/model/fields/field.py b/trytond/model/fields/field.py
index f24e65295d..424b04993f 100644
--- a/trytond/model/fields/field.py
+++ b/trytond/model/fields/field.py
@@ -54,9 +54,9 @@ class Field(object):
     _type = None
 
     def __init__(self, string='', help='', required=False, readonly=False,
-            domain=None, states=None, change_default=False, select=False,
-            on_change=None, on_change_with=None, depends=None,
-            order_field=None, context=None, loading='eager'):
+            domain=None, states=None, select=False, on_change=None,
+            on_change_with=None, depends=None, order_field=None, context=None,
+            loading='eager'):
         '''
         :param string: A string for label of the field.
         :param help: A multi-line help string.
@@ -68,8 +68,6 @@ class Field(object):
             ``readonly`` and ``invisible``. Values are pyson expressions that
             will be evaluated with record values. This allows to change
             dynamically the attributes of the field.
-        :param change_default: A boolean. If ``True`` the field can be used as
-        condition for a custom default value.
         :param select: An boolean. When True search will be optimized.
         :param on_change: A list of values. If set, the client will call the
             method ``on_change_<field_name>`` when the user changes the field
@@ -95,7 +93,6 @@ class Field(object):
         self.domain = domain or []
         self.__states = None
         self.states = states or {}
-        self.change_default = change_default
         self.select = bool(select)
         self.__on_change = None
         self.on_change = on_change
diff --git a/trytond/model/fields/float.py b/trytond/model/fields/float.py
index 4e88658a21..fb2a89c638 100644
--- a/trytond/model/fields/float.py
+++ b/trytond/model/fields/float.py
@@ -22,19 +22,18 @@ class Float(Field):
     _type = 'float'
 
     def __init__(self, string='', digits=None,  help='', required=False,
-            readonly=False, domain=None, states=None, change_default=False,
-            select=False, on_change=None, on_change_with=None, depends=None,
+            readonly=False, domain=None, states=None, select=False,
+            on_change=None, on_change_with=None, depends=None,
             order_field=None, context=None, loading='eager'):
         '''
         :param digits: a list of two integers defining the total
             of digits and the number of decimals of the float.
         '''
         super(Float, self).__init__(string=string, help=help,
-                required=required, readonly=readonly, domain=domain,
-                states=states, change_default=change_default, select=select,
-                on_change=on_change, on_change_with=on_change_with,
-                depends=depends, order_field=order_field, context=context,
-                loading=loading)
+            required=required, readonly=readonly, domain=domain, states=states,
+            select=select, on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
         self.__digits = None
         self.digits = digits
 
diff --git a/trytond/model/fields/many2many.py b/trytond/model/fields/many2many.py
index 3fa259449a..e04bde731e 100644
--- a/trytond/model/fields/many2many.py
+++ b/trytond/model/fields/many2many.py
@@ -14,9 +14,8 @@ class Many2Many(Field):
 
     def __init__(self, relation_name, origin, target, string='', order=None,
             datetime_field=None, help='', required=False, readonly=False,
-            domain=None, states=None, change_default=False,
-            on_change=None, on_change_with=None, depends=None,
-            order_field=None, context=None, loading='lazy'):
+            domain=None, states=None, on_change=None, on_change_with=None,
+            depends=None, order_field=None, context=None, loading='lazy'):
         '''
         :param relation_name: The name of the relation model
             or the name of the target model for ModelView only.
@@ -34,11 +33,10 @@ class Many2Many(Field):
             else:
                 depends = [datetime_field]
         super(Many2Many, self).__init__(string=string, help=help,
-                required=required, readonly=readonly, domain=domain,
-                states=states, change_default=change_default,
-                on_change=on_change, on_change_with=on_change_with,
-                depends=depends, order_field=order_field, context=context,
-                loading=loading)
+            required=required, readonly=readonly, domain=domain, states=states,
+            on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
         self.relation_name = relation_name
         self.origin = origin
         self.target = target
diff --git a/trytond/model/fields/many2one.py b/trytond/model/fields/many2one.py
index 48f391da06..7c20784229 100644
--- a/trytond/model/fields/many2one.py
+++ b/trytond/model/fields/many2one.py
@@ -12,8 +12,8 @@ class Many2One(Field):
 
     def __init__(self, model_name, string='', left=None, right=None,
             ondelete='SET NULL', datetime_field=None, help='', required=False,
-            readonly=False, domain=None, states=None, change_default=False,
-            select=False, on_change=None, on_change_with=None, depends=None,
+            readonly=False, domain=None, states=None, select=False,
+            on_change=None, on_change_with=None, depends=None,
             order_field=None, context=None, loading='eager'):
         '''
         :param model_name: The name of the target model.
@@ -37,11 +37,10 @@ class Many2One(Field):
             else:
                 depends = [datetime_field]
         super(Many2One, self).__init__(string=string, help=help,
-                required=required, readonly=readonly, domain=domain,
-                states=states, change_default=change_default, select=select,
-                on_change=on_change, on_change_with=on_change_with,
-                depends=depends, order_field=order_field, context=context,
-                loading=loading)
+            required=required, readonly=readonly, domain=domain, states=states,
+            select=select, on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
         self.model_name = model_name
         self.left = left
         self.right = right
diff --git a/trytond/model/fields/one2many.py b/trytond/model/fields/one2many.py
index 5ae64c629e..f51b6252c0 100644
--- a/trytond/model/fields/one2many.py
+++ b/trytond/model/fields/one2many.py
@@ -18,9 +18,9 @@ class One2Many(Field):
 
     def __init__(self, model_name, field, string='', add_remove=None,
             order=None, datetime_field=None, help='', required=False,
-            readonly=False, domain=None, states=None, change_default=False,
-            on_change=None, on_change_with=None, depends=None,
-            order_field=None, context=None, loading='lazy'):
+            readonly=False, domain=None, states=None, on_change=None,
+            on_change_with=None, depends=None, order_field=None, context=None,
+            loading='lazy'):
         '''
         :param model_name: The name of the target model.
         :param field: The name of the field that handle the reverse many2one.
@@ -38,11 +38,10 @@ class One2Many(Field):
             else:
                 depends = [datetime_field]
         super(One2Many, self).__init__(string=string, help=help,
-                required=required, readonly=readonly, domain=domain,
-                states=states, change_default=change_default,
-                on_change=on_change, on_change_with=on_change_with,
-                depends=depends, order_field=order_field, context=context,
-                loading=loading)
+            required=required, readonly=readonly, domain=domain, states=states,
+            on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
         self.model_name = model_name
         self.field = field
         self.__add_remove = None
diff --git a/trytond/model/fields/reference.py b/trytond/model/fields/reference.py
index de2895ee2d..c947e6dea8 100644
--- a/trytond/model/fields/reference.py
+++ b/trytond/model/fields/reference.py
@@ -13,8 +13,8 @@ class Reference(Field):
     _type = 'reference'
 
     def __init__(self, string='', selection=None, help='', required=False,
-            readonly=False, domain=None, states=None, change_default=False,
-            select=False, on_change=None, on_change_with=None, depends=None,
+            readonly=False, domain=None, states=None, select=False,
+            on_change=None, on_change_with=None, depends=None,
             order_field=None, context=None, loading='eager'):
         '''
         :param selection: A list or a function name that returns a list.
@@ -22,11 +22,10 @@ class Reference(Field):
             of model and the second is the user name of model.
         '''
         super(Reference, self).__init__(string=string, help=help,
-                required=required, readonly=readonly, domain=domain,
-                states=states, change_default=change_default, select=select,
-                on_change=on_change, on_change_with=on_change_with,
-                depends=depends, order_field=order_field, context=context,
-                loading=loading)
+            required=required, readonly=readonly, domain=domain, states=states,
+            select=select, on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
         self.selection = selection or None
 
     __init__.__doc__ += Field.__init__.__doc__
diff --git a/trytond/model/fields/selection.py b/trytond/model/fields/selection.py
index 7d804d2262..5193723e6a 100644
--- a/trytond/model/fields/selection.py
+++ b/trytond/model/fields/selection.py
@@ -12,9 +12,8 @@ class Selection(Field):
 
     def __init__(self, selection, string='', sort=True, translate=True,
             help='', required=False, readonly=False, domain=None, states=None,
-            change_default=False, select=False, on_change=None,
-            on_change_with=None, depends=None, order_field=None, context=None,
-            loading='eager'):
+            select=False, on_change=None, on_change_with=None, depends=None,
+            order_field=None, context=None, loading='eager'):
         '''
         :param selection: A list or a function name that returns a list.
             The list must be a list of tuples. First member is the value
@@ -22,11 +21,10 @@ class Selection(Field):
         :param sort: A boolean to sort or not the selections.
         '''
         super(Selection, self).__init__(string=string,  help=help,
-                required=required, readonly=readonly, domain=domain,
-                states=states, change_default=change_default, select=select,
-                on_change=on_change, on_change_with=on_change_with,
-                depends=depends, order_field=order_field, context=context,
-                loading=loading)
+            required=required, readonly=readonly, domain=domain, states=states,
+            select=select, on_change=on_change, on_change_with=on_change_with,
+            depends=depends, order_field=order_field, context=context,
+            loading=loading)
         if hasattr(selection, 'copy'):
             self.selection = selection.copy()
         else:
diff --git a/trytond/model/model.py b/trytond/model/model.py
index 67de426c88..4c45dc77f9 100644
--- a/trytond/model/model.py
+++ b/trytond/model/model.py
@@ -512,7 +512,6 @@ class Model(WarningErrorMixin, URLMixin):
                     'states',
                     'size',
                     'required',
-                    'change_default',
                     'translate',
                     'help',
                     'select',