diff --git a/product/ERP5/PropertySheet/Version.py b/product/ERP5/PropertySheet/Version.py
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+++ b/product/ERP5/PropertySheet/Version.py
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+##############################################################################
+#
+# Copyright (c) 2002 Nexedi SARL and Contributors. All Rights Reserved.
+#                    Jean-Paul Smets-Solanes <jp@nexedi.com>
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsability of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# garantees and support are strongly adviced to contract a Free Software
+# Service Company
+#
+# This program is Free Software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+##############################################################################
+
+class Version:
+    """
+        Properties which define the versions of a document
+    """
+
+    _properties = (
+        {   'id'          : 'version',
+            'description' : 'A version identifier',
+            'type'        : 'string',
+            'mode'        : 'w' },
+        {   'id'          : 'revision',
+            'description' : 'A revision identifier',
+            'type'        : 'string',
+            'mode'        : 'w' },
+    )
+
+    _categories = ()
+