stock_view.xml

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

        <!-- stock.picking -->
        <record id="view_picking_form" model="ir.ui.view">
            <field name="name">stock_picking_invoice_link.stock.picking.form</field>
            <field name="model">stock.picking</field>
            <field name="inherit_id" ref="stock_account.view_picking_inherit_form2"/>
            <field name="arch" type="xml">
                <field name="invoice_state" position="after">
                    <field name="invoice_id" string="Invoice" groups="account.group_account_invoice" attrs="{'invisible':[('invoice_state', '=', 'none')]}" context="{'form_view_ref': invoice_view_xmlid}"/>
                    <field name="invoice_view_xmlid" invisible="1"/>
                </field>
            </field>
        </record>

        <!-- stock.move -->
        <record id="view_move_form" model="ir.ui.view">
            <field name="name">stock_picking_invoice_link.stock.move.form</field>
            <field name="model">stock.move</field>
            <field name="inherit_id" ref="stock_account.view_move_form_inherit"/>
            <field name="arch" type="xml">
                <field name="invoice_state" position="after">
                    <field name="invoice_line_id" groups="account.group_account_invoice"/>
                </field>
            </field>
        </record>

        <record id="view_move_picking_form" model="ir.ui.view">
            <field name="name">stock_picking_invoice_link.stock.move.picking.form</field>
            <field name="model">stock.move</field>
            <field name="inherit_id" ref="stock_account.view_move_picking_from_stockaccount_inherit"/>
            <field name="arch" type="xml">
                <field name="invoice_state" position="after">
                    <field name="invoice_line_id" groups="account.group_account_invoice"/>
                </field>
            </field>
        </record>

</data>
</openerp>