account_budget_view.xml

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

    <data noupdate="0">

        <record model="ir.ui.view" id="crossovered_budget_view_form">
            <field name="name">crossovered.budget.view.form.inherited</field>
            <field name="model">crossovered.budget</field>
            <field name="inherit_id" ref="account_budget.crossovered_budget_view_form"/>
            <field name="arch" type="xml">
                <xpath expr="//notebook" position="before">
                    <button string="Add lines" name="%(action_account_budget_tweaks_lines)d" states="draft"
                            type="action" class="oe_highlight oe_left"/>
                </xpath>
                <xpath expr="//notebook" position="after">
                     <group string="Summary">
                          <field name="summary_line_ids" mode="tree" nolabel="1" colspan="1">
                              <tree>
                                  <field name="general_budget_id" string="Budgetary position"/>
                                  <field name="planned_amount" string="Planned Amount" sum="Planned Amount"/>
                                  <field name="practical_amount" string="Practical Amount" sum="Practical Amount"/>
                                  <field name="theoritical_amount" string="Theoretical Amount" sum="Theoretical Amount"/>
                              </tree>
                          </field>
                     </group>
                </xpath>
            </field>
        </record>

    </data>

</openerp>