diff --git a/addons/hr_timesheet/hr_timesheet_view.xml b/addons/hr_timesheet/hr_timesheet_view.xml
index d8a0b10b86f..315062ff575 100644
--- a/addons/hr_timesheet/hr_timesheet_view.xml
+++ b/addons/hr_timesheet/hr_timesheet_view.xml
@@ -12,7 +12,7 @@
 					<field name="account_id" on_change="on_change_account_id(account_id)" domain="[('type','=','normal')]"/>
                     <field name="name" />
 					<field name="unit_amount" on_change="on_change_unit_amount(product_id, unit_amount, product_uom_id)" />
-					<field name="product_id"/>
+					<field name="product_id" required="1"/>
 					<field name="product_uom_id" on_change="on_change_unit_amount(product_id, unit_amount, product_uom_id)" />
 					<field name="amount" />
 					<field name="general_account_id"/>
@@ -30,7 +30,7 @@
 					<field name="date" select="1"/>
 					<field name="unit_amount" on_change="on_change_unit_amount(product_id, unit_amount, product_uom_id)" />
 					<newline/>
-					<field name="product_id" on_change="on_change_unit_amount(product_id, unit_amount, product_uom_id)"/>
+					<field name="product_id" on_change="on_change_unit_amount(product_id, unit_amount, product_uom_id)" required="1"/>
 					<field name="product_uom_id" on_change="on_change_unit_amount(product_id, unit_amount, product_uom_id)" />
 
 					<field name="account_id" on_change="on_change_account_id(account_id)" domain="[('type','=','normal')]" select="1"/>