Could anybody tell me how to edit the qweb templat for the purchase order with a custom modul. I already tried it, but it doesent work and no error is given. If I add an id to the template it even shows under the associated QWeb views of Purchase Order.

__openerp__.py

{
    'name': 'report test',
    'version': '1.0',
    'category': 'test',
    'summary': 'test',
    'description': """
    test
    """,
    'author': 'test',
    'website': 'test',
    'depends': ['sales_team','account_voucher', 'procurement', 'report'],
    'data': [
        'views/report_purchase_extend.xml',
    ],
    'demo': [],
    'installable': True,
    'auto_install': False,
    'application': True,
}

views/report_purchase_extend.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data>
<template>
    <tr t-extend="purchase.report_purchaseorder">
        <t t-jquery="div.page" t-operation="replace">
                <t t-foreach="docs" t-as="o"/>
            <div class ="page">
            </div>
        </t>
    </tr>
</template>
</data>
</openerp>

and an empty __init__.py file.