diff --git a/doc/migrate/4.0.0-x.x.x/post.py b/doc/migrate/4.0.0-x.x.x/post.py
new file mode 100644
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+++ b/doc/migrate/4.0.0-x.x.x/post.py
@@ -0,0 +1,83 @@
+##############################################################################
+#
+# Copyright (c) 2006 TINY SPRL. (http://tiny.be) All Rights Reserved.
+#
+# 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.
+#
+##############################################################################
+
+__author__ = 'Gaetan de Menten, <ged@tiny.be>'
+__version__ = '0.1.0'
+
+import psycopg
+import optparse
+import ConfigParser
+
+# -----
+
+parser = optparse.OptionParser(version="Tiny ERP server migration script " + __version__)
+
+parser.add_option("-c", "--config", dest="config", help="specify path to Tiny ERP config file")
+
+group = optparse.OptionGroup(parser, "Database related options")
+group.add_option("--db_host", dest="db_host", help="specify the database host") 
+group.add_option("--db_port", dest="db_port", help="specify the database port") 
+group.add_option("-d", "--database", dest="db_name", help="specify the database name")
+group.add_option("-r", "--db_user", dest="db_user", help="specify the database user name")
+group.add_option("-w", "--db_password", dest="db_password", help="specify the database password") 
+parser.add_option_group(group)
+
+options = optparse.Values()
+options.db_name = 'terp' # default value
+parser.parse_args(values=options)
+
+if hasattr(options, 'config'):
+	configparser = ConfigParser.ConfigParser()
+	configparser.read([options.config])
+	for name, value in configparser.items('options'):
+		if not (hasattr(options, name) and getattr(options, name)):
+			if value in ('true', 'True'):
+				value = True
+			if value in ('false', 'False'):
+				value = False
+			setattr(options, name, value)
+
+# -----
+
+host = hasattr(options, 'db_host') and "host=%s" % options.db_host or ''
+port = hasattr(options, 'db_port') and "port=%s" % options.db_port or ''
+name = "dbname=%s" % options.db_name
+user = hasattr(options, 'db_user') and "user=%s" % options.db_user or ''
+password = hasattr(options, 'db_password') and "password=%s" % options.db_password or ''
+
+db = psycopg.connect('%s %s %s %s %s' % (host, port, name, user, password), serialize=0)
+cr = db.cursor()
+
+# ----------------------------- #
+# convert date_planned to delay #
+# ----------------------------- #
+
+cr.execute("update sale_order_line set delay = pt.sale_delay from product_product as po, product_template as pt where product_id = po.id and po.product_tmpl_id = pt.id")
+cr.commit()
+
+cr.close()
+