[FIX] hr_expense: AccessError on product

- Install hr_expense and stock.
- Add enough products which can be expensed so that a 'Search More...'
  option is proposed.
- Restrict the rights of a user U to 'Employee' only.
- As U, create an expense, and click on the 'Search More...' option when
choosing the product

An AccessError is raised on `stock.move`.

The error is due to fields `qty_available` and `virtual_quantity`.

These fields are not necessary in that context, so we define a specific
tree view for this use case.

opw-1891399

closes odoo/odoo#27561

addons/hr_expense/views/hr_expense_views.xml

@@ -49,7 +49,7 @@
                     </div>
                     <group>
                         <group>
-                            <field name="product_id" context="{'default_can_be_expensed': 1}"/>
+                            <field name="product_id" context="{'default_can_be_expensed': 1, 'tree_view_ref': 'hr_expense.product_product_expense_tree_view'}"/>
                             <field name="unit_amount" required="1" widget="monetary" options="{'currency_field': 'currency_id'}"/>
                             <label for="quantity"/>
                             <div>
@@ -286,6 +286,22 @@
             </field>
         </record>
 
+        <record id="product_product_expense_tree_view" model="ir.ui.view">
+            <field name="name">product.product.expense.tree</field>
+            <field name="model">product.product</field>
+            <field eval="50" name="priority"/>
+            <field name="arch" type="xml">
+                <tree string="Product Variants">
+                    <field name="default_code"/>
+                    <field name="name"/>
+                    <field name="attribute_value_ids" widget="many2many_tags" groups="product.group_product_variant"/>
+                    <field name="standard_price"/>
+                    <field name="uom_id" options="{'no_open': True, 'no_create': True}" groups="product.group_uom"/>
+                    <field name="barcode"/>
+                </tree>
+            </field>
+        </record>
+
         <record id="hr_expense_product" model="ir.actions.act_window">
             <field name="name">Expense Products</field>
             <field name="res_model">product.product</field>