diff --git a/addons/sale_project/views/project_task_views.xml b/addons/sale_project/views/project_task_views.xml
index c86ca96e4b7..1c727a7f5c0 100644
--- a/addons/sale_project/views/project_task_views.xml
+++ b/addons/sale_project/views/project_task_views.xml
@@ -305,8 +305,8 @@
                 <field name="allow_billable" column_invisible="True"/>
                 <field name="sale_line_id" optional="hide" options="{'no_open': True}" placeholder="Non-billable" readonly="1" groups="!sales_team.group_sale_salesman"/>
                 <field name="sale_line_id" optional="hide" options="{'no_create': True}" placeholder="Non-billable" groups="sales_team.group_sale_salesman"/>
-                <field name="quantity_percentage" string="Quantity (%)" optional="hide" widget="percentage" readonly="1" groups="!sales_team.group_sale_salesman"/>
-                <field name="quantity_percentage" string="Quantity (%)" optional="hide" widget="percentage" groups="sales_team.group_sale_salesman"/>
+                <field name="quantity_percentage" string="Quantity (%)" optional="hide" widget="percentage" groups="!sales_team.group_sale_salesman"/>
+                <field name="quantity_percentage" string="Quantity (%)" optional="hide" widget="percentage" readonly="0" groups="sales_team.group_sale_salesman"/>
                 <field name="product_uom_qty" optional="hide" groups="!sales_team.group_sale_salesman" readonly="1"/>
                 <field name="product_uom_qty" optional="hide" groups="sales_team.group_sale_salesman"/>
             </xpath>