diff --git a/stock_available_immediately/__init__.py b/stock_available_immediately/__init__.py
index 867607b7d..46f811108 100755
--- a/stock_available_immediately/__init__.py
+++ b/stock_available_immediately/__init__.py
@@ -17,3 +17,5 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 ##############################################################################
+
+from . import product
diff --git a/stock_available_immediately/product.py b/stock_available_immediately/product.py
new file mode 100644
index 000000000..491e44d1d
--- /dev/null
+++ b/stock_available_immediately/product.py
@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    Copyright 2010-2012 Camptocamp SA
+#    Copyright (C) 2011 Akretion Sébastien BEAU <sebastien.beau@akretion.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+from openerp import models
+
+
+class Product(models.Model):
+    """Subtract incoming qty from immediately_usable_qty"""
+    _inherit = 'product.product'
+
+    def _immediately_usable_qty(self):
+        """Ignore the incoming goods in the quantity available to promise"""
+        super(Product, self)._immediately_usable_qty()
+        for product in self:
+            product.immediately_usable_qty -= product.incoming_qty