<?xml version="1.0"?>
<pivot string="Tasks" sample="1" js_class="project_pivot">
                    <field name="project_id" type="row"/>
                    <field name="color" invisible="1"/>
                    <field name="sequence" invisible="1"/>
                    <field name="allocated_hours" widget="float_time"/>
                    <field name="working_hours_close" widget="float_time"/>
                    <field name="working_hours_open" widget="float_time"/>
                </pivot>
            