[UPD]Delete readonly field2

views/project_task.xml

@@ -22,7 +22,7 @@
             <field name="inherit_id" ref="project.view_task_tree2"/>
             <field name="arch" type="xml">
                 <xpath expr="//field[@name='remaining_hours']" position="after">
-                    <field name="manual_remaining_hours"  class="oe_read_only" widget="float_time"/>
+                    <field name="manual_remaining_hours" widget="float_time"/>
                     <field name="review_date"/>
                 </xpath>
             </field>