hr_expense_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record id="view_expenses_form_ext" model="ir.ui.view">
            <field name="name">view.expenses.form.ext</field>
            <field name="inherit_id" ref="hr_expense.view_expenses_form" />
            <field name="model">hr.expense.expense</field>
            <field name="arch" type="xml">
                <data>
                    <xpath expr="/form/sheet/group/group/field[@name='employee_id']" position="before">
						<field name="sqp_employee_id" />
					</xpath>		
                    <xpath expr="/form/sheet/notebook/page/field/tree/field[@name='product_id']" position="after">
						<field name="cost_order_id" options="{'limit': 10, 'create': false, 'create_edit': false}" />
					</xpath>	
				</data>
            </field>
        </record>
        <record id="view_expenses_tree_ext" model="ir.ui.view">
            <field name="name">view.expenses.tree.ext</field>
            <field name="inherit_id" ref="hr_expense.view_expenses_tree" />
            <field name="model">hr.expense.expense</field>
            <field name="arch" type="xml">
                <data>
                    <xpath expr="/tree/field[@name='employee_id']" position="replace">
						<field name="employee_id" invisible="1"/>
						<field name="sqp_employee_id" />
					</xpath>
				</data>
            </field>
        </record>
        <record id="view_hr_expense_filter_ext" model="ir.ui.view">
            <field name="name">view.hr.expense.filter.ext</field>
            <field name="inherit_id" ref="hr_expense.view_hr_expense_filter" />
            <field name="model">hr.expense.expense</field>
            <field name="arch" type="xml">
                <data>
                    <xpath expr="/search/field[@name='employee_id']" position="replace">
						<field name="sqp_employee_id" />
					</xpath>
                    <xpath expr="/search/group/filter[@string='Employee']" position="replace">
                        <filter string="Employee SQP" icon="terp-personal" domain="[]" context="{'group_by':'sqp_employee_id'}"/>
					</xpath>				
				</data>
            </field>
        </record>
    </data>
</openerp>