purchase_add_products/wizard/purchase_add_multiple.xml

<?xml version="1.0"?>
<openerp>
  <data>
    <record id="search_barcode_purchase_view" model="ir.ui.view">
      <field name="name">search.barcode.purchase.form</field>
      <field name="model">search.barcode.purchase</field>
      <field name="arch" type="xml">
        <form string="Agregar por EAN">
          <group>
            <field name="product_code"/>
          </group>
          <group string="Escaneos">
            <field name="line_ids" nolabel="1">
              <tree editable="bottom" string="Productos">
                <field name="product_id"/>
                <field name="qty"/>
              </tree>
            </field>
          </group>
          <footer>
            <button name="add_multiple" type="object" class="oe_highlight" string="Aceptar"/>
            <button string="Cancelar" class="oe_link" special="cancel"/>
          </footer>
        </form>
      </field>
    </record>

    <record id="action_purchase_add_multiple" model="ir.actions.act_window">
      <field name="name">Agregar por EAN</field>
      <field name="res_model">search.barcode.purchase</field>
      <field name="view_type">form</field>
      <field name="view_mode">form</field>
      <field name="view_id" ref="search_barcode_purchase_view"/>
      <field name="target">new</field>
    </record>
  </data>
</openerp>

<!-- <openerp>
    <data>
        <record model="ir.ui.view" id="search_barcode_purchase_view">
            <field name="name">search.barcode.purchase.form</field>
            <field name="model">search.barcode.purchase</field>
            <field name="arch" type="xml">
                <form string="Add Multiple">

                    <group>
                        <field name='product_code' />
                    </group>
                    <group>
                        <field name="products_ids" nolabel="1" domain="[('purchase_ok','=',True)]">
                          <tree string="Product Variants">
                            <field name="factory_reference"/>
                            <field name="factory_barcode"/>
                            <field name="product_tmpl_id"/>
                            <field name="attribute_value_ids" widget="many2many_tags"/>
                          </tree>
                        </field>
                    </group>
                <footer>
                    <button name="add_multiple" type="object" class="oe_highlight" string="Aceptar"/>
                </footer>
                </form>
            </field>
        </record>

        <record model="ir.actions.act_window" id="action_purchase_add_multiple">
            <field name="name">Purchase Order Add Multiple</field>
            <field name="res_model">search.barcode.purchase</field>
            <field name="view_type">form</field>
            <field name="view_mode">form</field>
            <field name="view_id" ref="search_barcode_purchase_view"/>
            <field name="target">new</field>
        </record>
    </data>
</openerp> -->