diff --git a/addons/sale_timesheet/models/project.py b/addons/sale_timesheet/models/project.py
index 0135390789d..d611d47fbeb 100644
--- a/addons/sale_timesheet/models/project.py
+++ b/addons/sale_timesheet/models/project.py
@@ -147,7 +147,7 @@ class ProjectTask(models.Model):
         help="Sales order item to which the task is linked. If an employee timesheets on a this task, "
         "and if this employee is not in the 'Employee/Sales Order Item Mapping' of the project, the "
         "timesheet entry will be linked to this sales order item.", copy=False)
-    sale_order_id = fields.Many2one('sale.order', 'Sales Order', compute='_compute_sale_order_id', compute_sudo=True, store=True, readonly=True, help="Sales order to which the task is linked.")
+    sale_order_id = fields.Many2one('sale.order', 'Sales Order', compute='_compute_sale_order_id', store=True, readonly=False, help="Sales order to which the task is linked.")
     billable_type = fields.Selection([
         ('task_rate', 'At Task Rate'),
         ('employee_rate', 'At Employee Rate'),
diff --git a/addons/sale_timesheet/views/project_task_views.xml b/addons/sale_timesheet/views/project_task_views.xml
index eae595102b3..7beb53bfbdb 100644
--- a/addons/sale_timesheet/views/project_task_views.xml
+++ b/addons/sale_timesheet/views/project_task_views.xml
@@ -50,8 +50,9 @@
             <field name="inherit_id" ref="project.view_task_form2"/>
             <field name="arch" type="xml">
                 <field name="partner_id" position="after">
-                    <field name="sale_line_id" string="Sales Order Item" attrs="{'invisible': ['|', ('partner_id', '=', False)]}" options='{"no_open": True}' readonly="1" context="{'create': False, 'edit': False, 'delete': False}"/>
+                    <field name="sale_line_id" string="Sales Order Item" attrs="{'invisible': ['|', ('partner_id', '=', False), '&amp;', ('sale_order_id', '!=', False), ('sale_line_id', '=', False)]}" options='{"no_open": True}' readonly="1" context="{'create': False, 'edit': False, 'delete': False}"/>
                     <field name="billable_type" invisible="1"/>
+                    <field name="sale_order_id" invisible="1" />
                 </field>
             </field>
         </record>