<?xml version="1.0"?>
<graph string="Timesheets" sample="1" js_class="hr_timesheet_graphview">
                    <field name="project_id" type="row"/>
                    <field name="task_id" type="row"/>
                    <field name="amount" string="Timesheet Costs"/>
                    <field name="unit_amount" type="measure" widget="timesheet_uom"/>
                </graph>
            