document_view.xml

<?xml version="1.0"?>
<openerp>
  <data>

    <!--Inherit ir.attachment Form View-->
    <record model="ir.ui.view" id="view_document_file_form_doc_backend">
      <field name="name">ir.attachment.doc.backend</field>
      <field name="model">ir.attachment</field>
      <field name="inherit_id" ref="document.view_document_file_form"/>
      <field name="arch" type="xml">
        <group string="Indexed Content" position="after">
          <group col="2" colspan="4">
            <field name="attachment_document_ids" nolabel="1" readonly="1">
              <tree string="AttachmentDocBackendTree">
                <field name="backend_id"/>
                <field name="object_doc_id"/>
              </tree>
              <form string="AttachmentDocBackendForm">
                <field name="backend_id"/>
                <field name="object_doc_id"/>
              </form>
            </field>
          </group>
        </group>
      </field>
    </record>

  </data>
</openerp>