diff --git a/message.xml b/message.xml
index a3470c1f39..db9a69f228 100644
--- a/message.xml
+++ b/message.xml
@@ -10,7 +10,7 @@ this repository contains the full copyright notices and license terms. -->
             <field name="text">The quantity of line "%(line)s" is greater than the remaining quantity (%(remaining)s) of agreement "%(agreement)s"</field>
         </record>
         <record model="ir.message" id="msg_agreement_line_incompatible_unit">
-            <field name="text">To change the unit of agreement line "%(line)s", you must choose one compatible with the existing purchase lines.</field>
+            <field name="text">To change the unit of agreement line "%(line)s", you must choose one compatible with the existing sale lines.</field>
         </record>
     </data>
 </tryton>