account_invoice_view.xml

<openerp>
    <data>
        <record model="ir.ui.view" id="invoice_form_add_notes">
            <field name="name">account.invoice.form.date_sent</field>
            <field name="model">account.invoice</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="account.invoice_form"/>
            <field name="arch" type="xml">
                <field name="comment" colspan="4" nolabel="1" position="replace">
                    <field name="comment" colspan="4"/>
                    <field name="note1" colspan="4" />
                    <field name="note2" colspan="4"/>
                </field>
            </field>
        </record>
        <record model="ir.ui.view" id="invoice_form_add_condition">
            <field name="name">account.invoice.form.condition</field>
            <field name="model">account.invoice</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="account.invoice_form"/>
            <field name="arch" type="xml">
                
                <field name="name" position="after"> 
                    <newline/>   
                    <field name="text_condition1"
                        domain="[('type','=','header')]" on_change="set_condition(text_condition1, 'note1', partner_id)"/>
                    <field name="text_condition2" 
                        domain="[('type','=','footer')]"  on_change="set_condition(text_condition2, 'note2', partner_id)"/>
                </field>
            </field>
        </record>
    </data>
</openerp>