eiru_sale_commission/views/sale_commission_view.xml

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

        <record model="ir.ui.view" id="sale_commission_tree">
            <field name="name">Sales commissions tree</field>
            <field name="model">sale.commission</field>
            <field name="arch" type="xml">
                <tree string="Commissions">
                    <field name="name" />
                    <field name="commission_type" />
                    <field name="amount_base_type" />
                </tree>
            </field>
        </record>

        <record model="ir.ui.view" id="sale_commission_form">
            <field name="name">Sales commissions form</field>
            <field name="model">sale.commission</field>
            <field name="arch" type="xml">
                <form string="Commission">
                    <group string="General information">
                        <group>
                            <field name="name" />
                            <field name="active" />
                            <field name="company_id" />
                        </group>
                        <group>
                            <field name="commission_type" />
                            <field name="amount_base_type" />
                            <field name="invoice_state"/>
                        </group>
                    </group>
                    <group string="Rates definition" colspan="4">
                        <field name="fix_qty"
                               attrs="{'invisible': [('commission_type', '!=', 'fixed')], 'required': [('commission_type', '=', 'fixed')]}" />
                    </group>
                </form>
            </field>
        </record>

        <record model="ir.actions.act_window" id="action_commission">
            <field name="name">Commission types</field>
            <field name="type">ir.actions.act_window</field>
            <field name="res_model">sale.commission</field>
            <field name="view_type">form</field>
            <field name="view_mode">tree,form</field>
        </record>

        <menuitem name="Commissions"
                  id="menu_sale_commissions_conf"
                  parent="base.menu_base_config" />

        <menuitem name="Commission types"
                  id="menu_sale_commissions_types"
                  parent="menu_sale_commissions_conf"
                  action="action_commission" />

    </data>
</openerp>