new_pdf_formats/views/sale_order.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>
    <record model="ir.ui.view" id="new_pdf_format_sale_form">
       <field name="name">new_pdf_format_sale_form</field>
       <field name="model">sale.order</field>
       <field name="inherit_id" ref="sale.view_order_form"/>
       <field name="arch" type="xml">
         <button name="print_quotation" states="draft" position="replace">
           <button name="print_quotation" string="Imprimir" type="object" states="draft" class="oe_highlight" groups="base.group_user" invisible="1"/>
         </button>
         <button name="print_quotation" states="sent,progress,manual" position="replace">
           <button name="print_quotation2" string="Imprimir" type="object" states="sent,progress,manual" groups="base.group_user" invisible="1"/>
         </button>

       </field>
    </record>
  </data>
</openerp>