knowledge/document_page_partner_id/views/document_page.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record id="view_wiki_form" model="ir.ui.view">
            <field name="model">document.page</field>
            <field name="inherit_id" ref="document_page.view_wiki_form" />
            <field name="arch" type="xml">
                <field name="parent_id" position="after">
                    <field name="partner_id" />
                </field>
            </field>
        </record>
        <record id="view_wiki_tree" model="ir.ui.view">
            <field name="model">document.page</field>
            <field name="inherit_id" ref="document_page.view_wiki_tree" />
            <field name="arch" type="xml">
                <field name="parent_id" position="after">
                    <field name="partner_id" />
                </field>
            </field>
        </record>
        <record id="view_wiki_filter" model="ir.ui.view">
            <field name="model">document.page</field>
            <field name="inherit_id" ref="document_page.view_wiki_filter" />
            <field name="arch" type="xml">
                <field name="name" position="after">
                    <field name="partner_id" />
                </field>
                <xpath expr="//group//filter/ancestor::group">
                    <filter name="partner_id" string="Partner" domain="[]" context="{'group_by': 'partner_id'}" />
                </xpath>
            </field>
        </record>
    </data>
</openerp>