This importation works very well in my custom module :

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

         <openerp>

              <data>

                  <record id="stock.stock_location_route_tree" model="ir.ui.view">

                      <field name="name">stock.location.route.tree</field>

                      <field name="model">stock.location.route</field>

                      <field name="arch" type="xml">

                      <tree string="Routes">

                      <field name="sequence" widget="handle" />

                      <field name="id" />

                      <field name="name" />

                      <field name="company_id" />

                      <field name="product_categ_selectable" />

                      <field name="product_selectable" />

                      <field name="warehouse_selectable" />

                      <field name="push_ids" />

                      <field name="pull_ids" />

                  </tree>

                   </field>

      </record>

      </data>

</openerp>

But if I add this field :

         <field name="sale_selectable"/>

I get an error :

             [.......]

             Error details:

             Field `sale_selectable` does not exist

             [.......]

If I add the same line via the backend, in Settings->Views, it works!

How could it be possible?