diff --git a/addons/hr_expense/views/hr_expense_views.xml b/addons/hr_expense/views/hr_expense_views.xml
index c4aec67d67b..01ab49ea0c7 100644
--- a/addons/hr_expense/views/hr_expense_views.xml
+++ b/addons/hr_expense/views/hr_expense_views.xml
@@ -143,7 +143,7 @@
                             <div class="o_row" attrs="{'invisible': ['|', ('product_description', '=', False), ('product_id', '=', False)]}">
                                 <field name ="product_description" class="font-italic"/>
                             </div>
-                            <field name="unit_amount" required="1" widget="monetary" options="{'currency_field': 'currency_id', 'field_digits': True}" attrs="{'invisible': [('product_has_cost', '=', False)], 'readonly': [('sheet_is_editable', '=', False)]}"/>
+                            <field name="unit_amount" required="1" force_save="1" widget="monetary" options="{'currency_field': 'currency_id', 'field_digits': True}" attrs="{'invisible': [('product_has_cost', '=', False)], 'readonly': ['|', ('sheet_is_editable', '=', False), ('product_has_cost', '=', True)]}"/>
                             <field name="product_uom_category_id" invisible="1"/>
                             <label for="quantity" attrs="{'invisible': [('product_has_cost', '=', False)]}"/>
                             <div class="o_row" attrs="{'invisible': [('product_has_cost', '=', False)]}">