diff --git a/CHANGELOG b/CHANGELOG
index 6dfac0a095..4436966d1b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Add option to show revisions
 * Add a multi selection widget for many2many
 * Remove auto-refresh
 * Add support of domain for non-relation field
diff --git a/tryton/action/main.py b/tryton/action/main.py
index 33ecfd45bf..00ae9d9191 100644
--- a/tryton/action/main.py
+++ b/tryton/action/main.py
@@ -113,6 +113,7 @@ class Action(object):
             action_ctx = decoder.decode(action.get('pyson_context') or '{}')
             ctx.update(action_ctx)
             ctx.update(context)
+            action_ctx.update(context)
 
             ctx['context'] = ctx
             decoder = PYSONDecoder(ctx)
diff --git a/tryton/common/common.py b/tryton/common/common.py
index 29513198f2..d6ced20b15 100644
--- a/tryton/common/common.py
+++ b/tryton/common/common.py
@@ -168,6 +168,23 @@ class ModelAccess(object):
 MODELACCESS = ModelAccess()
 
 
+class ModelHistory(object):
+    _models = set()
+
+    def load_history(self):
+        self._models.clear()
+        try:
+            self._models.update(rpc.execute('model', 'ir.model',
+                    'list_history', rpc.CONTEXT))
+        except TrytonServerError:
+            pass
+
+    def __contains__(self, model):
+        return model in self._models
+
+MODELHISTORY = ModelHistory()
+
+
 class ViewSearch(object):
     searches = None
 
diff --git a/tryton/common/date_widget.py b/tryton/common/date_widget.py
index a94ed66f28..20b4f2314c 100644
--- a/tryton/common/date_widget.py
+++ b/tryton/common/date_widget.py
@@ -154,7 +154,11 @@ class DateEntry(gtk.Entry):
     def set_text(self, text):
         self._interactive_input = False
         try:
+            # Force position as _on_insert_text use it
+            position = self.get_position()
+            self.set_position(0)
             gtk.Entry.set_text(self, text)
+            self.idle_set_position(position)
         finally:
             self._interactive_input = True
 
@@ -217,7 +221,7 @@ class DateEntry(gtk.Entry):
         res = None
         date = self.compute_date(self.get_text())
         try:
-            res = datetime.datetime(*time.strptime(date, self.format)[:6])
+            res = datetime.datetime.strptime(date, self.format)
         except ValueError:
             return None
         if set_text:
diff --git a/tryton/gui/main.py b/tryton/gui/main.py
index c04933fcff..237989d9ba 100644
--- a/tryton/gui/main.py
+++ b/tryton/gui/main.py
@@ -855,6 +855,7 @@ class Main(object):
             for target in (
                     common.ICONFACTORY.load_icons,
                     common.MODELACCESS.load_models,
+                    common.MODELHISTORY.load_history,
                     common.VIEW_SEARCH.load_searches,
                     ):
                 t = threading.Thread(target=target)
diff --git a/tryton/gui/window/attachment.py b/tryton/gui/window/attachment.py
index 6cacc8ea82..ea326370cc 100644
--- a/tryton/gui/window/attachment.py
+++ b/tryton/gui/window/attachment.py
@@ -15,11 +15,12 @@ class Attachment(WinForm):
     def __init__(self, record, callback=None):
         self.resource = '%s,%s' % (record.model_name, record.id)
         self.attachment_callback = callback
+        context = record.context_get()
+        context['resource'] = self.resource
         screen = Screen('ir.attachment', domain=[
             ('resource', '=', self.resource),
-            ], mode=['tree', 'form'], context={
-                'resource': self.resource,
-            }, exclude_field='resource')
+            ], mode=['tree', 'form'], context=context,
+            exclude_field='resource')
         screen.search_filter()
         screen.parent = record
         super(Attachment, self).__init__(screen, self.callback,
diff --git a/tryton/gui/window/form.py b/tryton/gui/window/form.py
index 4f17443a19..76cadedd3f 100644
--- a/tryton/gui/window/form.py
+++ b/tryton/gui/window/form.py
@@ -11,11 +11,13 @@ from tryton.gui.window import Window
 from tryton.gui.window.win_export import WinExport
 from tryton.gui.window.win_import import WinImport
 from tryton.gui.window.attachment import Attachment
+from tryton.gui.window.revision import Revision
 from tryton.signal_event import SignalEvent
 from tryton.common import message, sur, sur_3b, COLOR_SCHEMES, timezoned_date
 import tryton.common as common
 from tryton.translate import date_format
 from tryton.common import RPCExecute, RPCException
+from tryton.common.datetime_strftime import datetime_strftime
 from tryton import plugins
 
 from tabcontent import TabContent
@@ -61,6 +63,7 @@ class Form(SignalEvent, TabContent):
         (_('_Next'), 'tryton-go-next', 'sig_next', '<tryton>/Form/Next'),
         (_('_Search'), 'tryton-find', 'sig_search', '<tryton>/Form/Search'),
         (_('View _Logs...'), None, 'sig_logs', None),
+        (_('Show revisions...'), 'tryton-clock', 'revision', None),
         (None,) * 4,
         (_('_Close Tab'), 'tryton-close', 'sig_win_close',
             '<tryton>/Form/Close'),
@@ -96,8 +99,6 @@ class Form(SignalEvent, TabContent):
             domain = []
         if view_ids is None:
             view_ids = []
-        if context is None:
-            context = {}
 
         self.model = model
         self.res_id = res_id
@@ -107,7 +108,7 @@ class Form(SignalEvent, TabContent):
         self.view_ids = view_ids
         self.dialogs = []
 
-        self.screen = Screen(self.model, mode=mode, context=self.context,
+        self.screen = Screen(self.model, mode=mode, context=context,
             view_ids=view_ids, domain=domain, limit=limit, order=order,
             search_value=search_value, tab_domain=tab_domain)
         self.screen.widget.show()
@@ -117,6 +118,12 @@ class Form(SignalEvent, TabContent):
         else:
             self.name = name
 
+        if self.model not in common.MODELHISTORY:
+            self.menu_def = self.menu_def[:]
+            # Remove callback to revision
+            self.menu_def[11] = (self.menu_def[11][:2] + (None,)
+                + self.menu_def[11][3:])
+
         self.create_tabcontent()
 
         self.url_entry = url_entry = gtk.Entry()
@@ -154,10 +161,12 @@ class Form(SignalEvent, TabContent):
                     in ('tree', 'graph', 'calendar'):
                 self.screen.search_filter()
 
+        self.update_revision()
+
     def get_toolbars(self):
         try:
             return RPCExecute('model', self.model, 'view_toolbar_get',
-                context=self.context)
+                context=self.screen.context)
         except RPCException:
             return {}
 
@@ -174,7 +183,7 @@ class Form(SignalEvent, TabContent):
             and self.domain == value.domain
             and self.mode == value.mode
             and self.view_ids == value.view_ids
-            and self.context == value.context
+            and self.screen.context == value.screen.context
             and self.name == value.name
             and self.screen.limit == value.screen.limit
             and self.screen.search_value == value.screen.search_value)
@@ -235,7 +244,7 @@ class Form(SignalEvent, TabContent):
 
         try:
             res = RPCExecute('model', self.model, 'read', [obj_id],
-                [x[0] for x in fields], context=self.context)
+                [x[0] for x in fields], context=self.screen.context)
         except RPCException:
             return
         message_str = ''
@@ -252,6 +261,42 @@ class Form(SignalEvent, TabContent):
         message(message_str)
         return True
 
+    def revision(self, widget=None):
+        if not self.modified_save():
+            return
+        current_id = (self.screen.current_record.id
+            if self.screen.current_record else None)
+        try:
+            revisions = RPCExecute('model', self.model, 'history_revisions',
+                [r.id for r in self.screen.selected_records])
+        except RPCException:
+            return
+        revision = self.screen.context.get('_datetime')
+        revision = Revision(revisions, revision).run()
+        if revision != self.screen.context.get('_datetime'):
+            self.screen.clear()
+            # Update root group context that will be propagated
+            self.screen.group._context['_datetime'] = revision
+            if self.screen.current_view.view_type != 'form':
+                self.screen.search_filter(
+                    self.screen.screen_container.get_text())
+            else:
+                # Test if record exist in revisions
+                self.screen.load([current_id])
+            self.screen.display(set_cursor=True)
+            self.update_revision()
+
+    def update_revision(self):
+        revision = self.screen.context.get('_datetime')
+        if revision:
+            format_ = date_format() + ' %H:%M:%S.%f'
+            revision = datetime_strftime(revision, format_)
+            self.title.set_label('%s @ %s' % (self.name, revision))
+        else:
+            self.title.set_label(self.name)
+        for button in ('new', 'save'):
+            self.buttons[button].props.sensitive = not revision
+
     def sig_remove(self, widget=None):
         if not common.MODELACCESS[self.model]['delete']:
             return
@@ -271,7 +316,7 @@ class Form(SignalEvent, TabContent):
         fields = {}
         for name, field in self.screen.group.fields.iteritems():
             fields[name] = field.attrs
-        WinImport(self.model, self.context)
+        WinImport(self.model, self.screen.context)
 
     def sig_save_as(self, widget=None):
         while self.screen.view_to_load:
@@ -279,7 +324,7 @@ class Form(SignalEvent, TabContent):
         fields = {}
         for name, field in self.screen.group.fields.iteritems():
             fields[name] = field.attrs
-        WinExport(self.model, self.ids_get(), context=self.context)
+        WinExport(self.model, self.ids_get(), context=self.screen.context)
 
     def sig_new(self, widget=None, autosave=True):
         if not common.MODELACCESS[self.model]['create']:
@@ -296,13 +341,7 @@ class Form(SignalEvent, TabContent):
             return
         if not self.modified_save():
             return
-        ids = [r.id for r in self.screen.selected_records]
-        try:
-            new_ids = RPCExecute('model', self.model, 'copy', ids, {},
-                context=self.context)
-        except RPCException:
-            return
-        self.screen.load(new_ids)
+        self.screen.copy()
         self.message_info(_('Working now on the duplicated record(s)!'),
             'green')
 
@@ -336,11 +375,12 @@ class Form(SignalEvent, TabContent):
         self.screen.cancel_current()
         set_cursor = False
         self.screen.save_tree_state(store=False)
+        record_id = (self.screen.current_record.id
+            if self.screen.current_record else None)
         if self.screen.current_view.view_type != 'form':
-            obj_id = self.id_get()
             self.screen.search_filter(self.screen.screen_container.get_text())
             for record in self.screen.group:
-                if record.id == obj_id:
+                if record.id == record_id:
                     self.screen.current_record = record
                     set_cursor = True
                     break
@@ -467,7 +507,7 @@ class Form(SignalEvent, TabContent):
             'id': record_id,
             'ids': record_ids,
         }
-        Action._exec_action(action, data, self.context)
+        Action._exec_action(action, data, self.screen.context)
 
     def activate_save(self):
         self.buttons['save'].props.sensitive = self.screen.modified()
diff --git a/tryton/gui/window/revision.py b/tryton/gui/window/revision.py
new file mode 100644
index 0000000000..ec371b8b13
--- /dev/null
+++ b/tryton/gui/window/revision.py
@@ -0,0 +1,68 @@
+#This file is part of Tryton.  The COPYRIGHT file at the top level of
+#this repository contains the full copyright notices and license terms.
+import gtk
+import gettext
+
+from tryton.config import TRYTON_ICON
+from tryton.common import get_toplevel_window
+from tryton.common.date_widget import DateEntry
+from tryton.common.datetime_strftime import datetime_strftime
+from tryton.translate import date_format
+
+_ = gettext.gettext
+
+
+class Revision(object):
+    'Ask revision'
+
+    def __init__(self, revisions, revision=None):
+        self.parent = get_toplevel_window()
+        self.win = gtk.Dialog(_('Revision'), self.parent,
+            gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
+            (gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL,
+                gtk.STOCK_OK, gtk.RESPONSE_OK))
+        self.win.set_default_response(gtk.RESPONSE_OK)
+        self.win.set_icon(TRYTON_ICON)
+        self.win.set_has_separator(True)
+        self.win.vbox.set_spacing(3)
+        self.win.vbox.pack_start(gtk.Label(
+                _('Select a revision')), expand=False, fill=True)
+        self.win.vbox.pack_start(gtk.HSeparator())
+        hbox = gtk.HBox(spacing=3)
+        hbox.pack_start(gtk.Label(_('Revision:')), expand=True, fill=True)
+        format_ = date_format() + ' %H:%M:%S.%f'
+        self.entry = DateEntry(format_)
+        if revision:
+            self.entry.set_text(datetime_strftime(revision, format_))
+        list_store = gtk.ListStore(str, str)
+        list_store.append(('', ''))
+        for revision, id_, name in revisions:
+            list_store.append((datetime_strftime(revision, format_), name))
+        combobox = gtk.ComboBoxEntry(list_store)
+        combobox.add(self.entry)
+        cell = gtk.CellRendererText()
+        combobox.pack_start(cell, True)
+        combobox.add_attribute(cell, 'text', 1)
+        hbox.pack_start(combobox, expand=True, fill=True)
+        combobox.set_entry_text_column(0)
+        combobox.connect('changed', self.changed)
+        self.entry.set_property('activates_default', True)
+        self.win.vbox.pack_start(hbox, expand=True, fill=True)
+        self.win.show_all()
+
+    def changed(self, combobox):
+        # set_text must be called because DateEntry doesn't work correctly with
+        # the default insert/delete text behavior of combobox
+        model = combobox.get_model()
+        idx = combobox.get_active()
+        if idx >= 0:
+            self.entry.set_text(model[idx][0])
+
+    def run(self):
+        response = self.win.run()
+        revision = None
+        if response == gtk.RESPONSE_OK:
+            revision = self.entry.date_get()
+        self.parent.present()
+        self.win.destroy()
+        return revision
diff --git a/tryton/gui/window/tabcontent.py b/tryton/gui/window/tabcontent.py
index fb473444c8..401c0dcd92 100644
--- a/tryton/gui/window/tabcontent.py
+++ b/tryton/gui/window/tabcontent.py
@@ -43,7 +43,7 @@ class TabContent(object):
         self.widget.pack_start(self.scrolledwindow)
 
     def make_title_bar(self):
-        title = gtk.Label()
+        self.title = title = gtk.Label()
         title.modify_font(pango.FontDescription("bold 14"))
         title.set_label(self.name)
         title.set_padding(10, 4)
diff --git a/tryton/gui/window/view_form/model/record.py b/tryton/gui/window/view_form/model/record.py
index ad1914290c..c64b0fa093 100644
--- a/tryton/gui/window/view_form/model/record.py
+++ b/tryton/gui/window/view_form/model/record.py
@@ -602,7 +602,7 @@ class Record(SignalEvent):
                     'search_count', [
                         ('resource', '=',
                             '%s,%s' % (self.model_name, self.id)),
-                        ])
+                        ], context=self.context_get())
             except RPCException:
                 return 0
         return self.attachment_count
diff --git a/tryton/gui/window/view_form/screen/screen.py b/tryton/gui/window/view_form/screen/screen.py
index 3708f49c0d..6fcb700b26 100644
--- a/tryton/gui/window/view_form/screen/screen.py
+++ b/tryton/gui/window/view_form/screen/screen.py
@@ -46,8 +46,6 @@ class Screen(SignalEvent):
             view_ids = []
         if mode is None:
             mode = ['tree', 'form']
-        if context is None:
-            context = {}
         if views_preload is None:
             views_preload = {}
         if domain is None:
@@ -69,7 +67,6 @@ class Screen(SignalEvent):
         self.size_limit = None
         self.views_preload = views_preload
         self.model_name = model_name
-        self.context = context
         self.views = []
         self.view_ids = view_ids[:]
         self.parent = None
@@ -80,7 +77,7 @@ class Screen(SignalEvent):
             lambda: collections.defaultdict(lambda: None))
         self.tree_states_done = set()
         self.__group = None
-        self.new_group()
+        self.new_group(context or {})
         self.__current_record = None
         self.current_record = None
         self.screen_container = ScreenContainer(tab_domain)
@@ -230,6 +227,10 @@ class Screen(SignalEvent):
         self.load(ids)
         return bool(ids)
 
+    @property
+    def context(self):
+        return self.group.context
+
     def __get_group(self):
         return self.__group
 
@@ -260,9 +261,10 @@ class Screen(SignalEvent):
 
     group = property(__get_group, __set_group)
 
-    def new_group(self):
+    def new_group(self, context=None):
+        context = context if context is not None else self.context
         self.group = Group(self.model_name, {}, domain=self.domain,
-            context=self.context, readonly=self.readonly)
+            context=context, readonly=self.readonly)
 
     def _group_cleared(self, group, signal):
         for view in self.views:
diff --git a/tryton/gui/window/win_form.py b/tryton/gui/window/win_form.py
index 98687d1ab7..3f866d337a 100644
--- a/tryton/gui/window/win_form.py
+++ b/tryton/gui/window/win_form.py
@@ -122,6 +122,7 @@ class WinForm(NoModal):
             hbox = gtk.HBox(homogeneous=False, spacing=0)
             tooltips = common.Tooltips()
             access = common.MODELACCESS[screen.model_name]
+            readonly = self.screen.group.readonly
 
             if domain is not None:
                 self.wid_text = gtk.Entry()
@@ -140,7 +141,7 @@ class WinForm(NoModal):
                 self.but_add.add(img_add)
                 self.but_add.set_relief(gtk.RELIEF_NONE)
                 hbox.pack_start(self.but_add, expand=False, fill=False)
-                if not access['read']:
+                if not access['read'] or readonly:
                     self.but_add.set_sensitive(False)
 
                 self.but_remove = gtk.Button()
@@ -153,7 +154,7 @@ class WinForm(NoModal):
                 self.but_remove.add(img_remove)
                 self.but_remove.set_relief(gtk.RELIEF_NONE)
                 hbox.pack_start(self.but_remove, expand=False, fill=False)
-                if not access['read']:
+                if not access['read'] or readonly:
                     self.but_remove.set_sensitive(False)
 
                 hbox.pack_start(gtk.VSeparator(), expand=False, fill=True)
@@ -167,7 +168,7 @@ class WinForm(NoModal):
             self.but_new.add(img_new)
             self.but_new.set_relief(gtk.RELIEF_NONE)
             hbox.pack_start(self.but_new, expand=False, fill=False)
-            if not access['create']:
+            if not access['create'] or readonly:
                 self.but_new.set_sensitive(False)
 
             self.but_del = gtk.Button()
@@ -180,7 +181,7 @@ class WinForm(NoModal):
             self.but_del.add(img_del)
             self.but_del.set_relief(gtk.RELIEF_NONE)
             hbox.pack_start(self.but_del, expand=False, fill=False)
-            if not access['delete']:
+            if not access['delete'] or readonly:
                 self.but_del.set_sensitive(False)
 
             self.but_undel = gtk.Button()
@@ -194,6 +195,8 @@ class WinForm(NoModal):
             self.but_undel.add(img_undel)
             self.but_undel.set_relief(gtk.RELIEF_NONE)
             hbox.pack_start(self.but_undel, expand=False, fill=False)
+            if not access['delete'] or readonly:
+                self.but_undel.set_sensitive(False)
 
             hbox.pack_start(gtk.VSeparator(), expand=False, fill=True)
 
@@ -355,9 +358,10 @@ class WinForm(NoModal):
 
     def _sig_label(self, screen, signal_data):
         name = '_'
+        access = common.MODELACCESS[screen.model_name]
+        readonly = screen.group.readonly
         if signal_data[0] >= 1:
             name = str(signal_data[0])
-            self.but_del.set_sensitive(True)
             if self.domain is not None:
                 self.but_remove.set_sensitive(True)
             if signal_data[0] < signal_data[1]:
@@ -368,8 +372,9 @@ class WinForm(NoModal):
                 self.but_pre.set_sensitive(True)
             else:
                 self.but_pre.set_sensitive(False)
-            self.but_del.set_sensitive(True)
-            self.but_undel.set_sensitive(True)
+            if access['delete'] and not readonly:
+                self.but_del.set_sensitive(True)
+                self.but_undel.set_sensitive(True)
         else:
             self.but_del.set_sensitive(False)
             self.but_undel.set_sensitive(False)