diff --git a/message.xml b/message.xml
new file mode 100644
index 0000000000..339e9264fc
--- /dev/null
+++ b/message.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
+<tryton>
+    <data grouped="1">
+        <record model="ir.message" id="msg_shipment_cost_post_no_shipment">
+            <field name="text">The shipment cost "%(shipment_cost)s" has no shipment.</field>
+        </record>
+        <record model="ir.message" id="msg_shipment_cost_post_same_parties">
+            <field name="text">The shipment "%(shipment)s" of shipment cost "%(shipment_cost)s" has already shipment cost from the same party "%(other)s".</field>
+        </record>
+    </data>
+</tryton>
diff --git a/tryton.cfg b/tryton.cfg
index 0622705b9d..e04adb97eb 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -10,3 +10,4 @@ depends:
 xml:
     product.xml
     account.xml
+    message.xml