partner_view.xml

<?xml version="1.0"?>
<openerp>
    <data>
        <record id="view_partner_form_account_button" model="ir.ui.view">
            <field name="name">res.partner.som.form</field>
            <field name="model">res.partner</field>
            <field name="type">form</field>
            <field name="priority">90</field>
            <field name="inherit_id" ref="account.view_partner_property_form"/>
            <field name="arch" type="xml">
                <xpath expr="//field[@name='payment_type_customer']" position="before">
                    <button name="button_assign_accounts" type="object"
                    colspan="2" string="Assignar compte a cobrar"
                    icon="gtk-execute"/>
                </xpath>
            </field>
        </record>
        <record id="view_partner_form_account_fields" model="ir.ui.view">
            <field name="name">res.partner.som.form.fields</field>
            <field name="model">res.partner</field>
            <field name="type">form</field>
            <field name="priority">90</field>
            <field name="inherit_id" ref="account.view_partner_property_form"/>
            <field name="arch" type="xml">
                <xpath expr="//field[@name='payment_type_supplier']"
                       position="after">
                    <group id="aportacions" col="2" colspan="2">
                        <separator string="Comptes inversions" colspan="2"/>
                        <field name="property_account_aportacions"/>
						<field name="property_account_titols"/>
                        <field name="property_account_liquidacio"/>
                        <field name="property_account_gkwh"/>
                    </group>
                </xpath>
            </field>
        </record>
        <record id="view_partner_form_soci_fields" model="ir.ui.view">
            <field name="name">res.partner.som.form.soci</field>
            <field name="model">res.partner</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="priority" eval="20"/>
            <field name="arch" type="xml">
                <data>
                    <xpath expr="//form[@string='Partners']/group/field[@name='supplier']" position="after">
                        <group colspan="2" attrs="{'invisible': [('ref', '!=', False)]}">
                            <button name="button_assign_soci_seq" string="Nou soci" type="object" icon="gtk-execute" colspan="1"/>
                        </group>
                        <label string="" colspan="4"/>
                    </xpath>
                </data>
            </field>
        </record>
    </data>
</openerp>