diff --git a/addons/hr_expense/views/hr_expense_views.xml b/addons/hr_expense/views/hr_expense_views.xml
index e75e4467e72..369a7f933e7 100644
--- a/addons/hr_expense/views/hr_expense_views.xml
+++ b/addons/hr_expense/views/hr_expense_views.xml
@@ -98,6 +98,8 @@
                 <xpath expr="/form/*" position="before">
                     <header>
                         <button name="action_submit_expenses" states="draft" string="Submit to Manager" type="object" class="oe_highlight"/>
+                        <widget name="attach_document" string="Attach Document" action="message_post" attrs="{'invisible': [('attachment_number', '&lt;=', 0)]}"/>
+                        <widget name="attach_document" string="Attach Document" action="message_post" class="oe_highlight" attrs="{'invisible': [('attachment_number', '&gt;=', 1)]}"/>
                         <field name="state" widget="statusbar" statusbar_visible="draft,reported,approved,done,refused"/>
                         <button name="action_view_sheet" type="object" string="View Report" class="oe_highlight" attrs="{'invisible': [('state', '=','draft')]}"/>
                     </header>