hr_timesheet_sheet_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <record id="view_hr_timesheet_sheet_filter_custom" model="ir.ui.view">
            <field name="name">hr_timesheet_sheet.sheet.filter</field>
            <field name="model">hr_timesheet_sheet.sheet</field>
            <field name="inherit_id" ref="hr_timesheet_sheet.view_hr_timesheet_sheet_filter"/>
            <field name="arch" type="xml">
                <filter name="to_approve" position="after">
                    <separator orientation="vertical"/>
                    <filter icon="terp-go-year" string="Current Year"
                        domain="[('date_from','&lt;=', time.strftime('%%Y-%%m-%%d')),('date_from','&gt;=',time.strftime('%%Y-01-01'))]"
                        help="Current Year"/>
                    <filter icon="terp-go-month" string="Current Month" name="month"
                        domain="[('date_from','&lt;=',(context_today()+relativedelta(day=31)).strftime('%%Y-%%m-%%d')),('date_from','&gt;=',(context_today()-relativedelta(day=1)).strftime('%%Y-%%m-%%d'))]"
                        help="Current Month"/>
                    <filter icon="terp-go-week" string="Current Week" separator="1" name="week"
                        domain="[('date_from','&gt;=',(context_today()+relativedelta(days=-6,weekday=0)).strftime('%%Y-%%m-%%d')),('date_from','&lt;=',(context_today()+relativedelta(weekday=6)).strftime('%%Y-%%m-%%d'))]"
                        help="Current Week"/>
                </filter>

            </field>
        </record>

        <record model="ir.ui.view" id="hr_timesheet_sheet_form_with_activity">
            <field name="name">hr.timesheet.sheet.form</field>
            <field name="model">hr_timesheet_sheet.sheet</field>
            <field name="inherit_id" ref="hr_timesheet_sheet.hr_timesheet_sheet_form"/>
            <field name="arch" type="xml">
                <xpath
                    expr="/form/sheet/notebook/page[@string='Details']/field[@name='timesheet_ids']/tree[@string='Timesheet Activities']/field[@name='account_id']"
                    position="after">
                    <field name="task_id" context="{'account_id' : account_id}"
                        domain="[('project_id.analytic_account_id','=',account_id)]"/>
                </xpath>
                <xpath
                    expr="/form/sheet/notebook/page[@string='Details']/field[@name='timesheet_ids']/form[@string='Timesheet Activities']/field[@name='account_id']"
                    position="after">
                    <field name="task_id" context="{'account_id' : account_id}"
                        domain="[('project_id.analytic_account_id','=',account_id)]"/>
                </xpath>
            </field>
        </record>
    </data>
</openerp>