[IMP] sale_usability: access to sale orders from invoice view

sale_usability/views/account_move.xml

@@ -7,24 +7,24 @@
 
 <odoo>
 
-<!--
 <record id="account_invoice_form" model="ir.ui.view">
     <field name="name">sale_usability.customer.invoice.form</field>
-    <field name="model">account.invoice</field>
-    <field name="inherit_id" ref="sale.account_invoice_form"/>
+    <field name="model">account.move</field>
+    <field name="inherit_id" ref="sale.account_invoice_form" />
+    <field name="groups_id" eval="[(4, ref('sales_team.group_sale_manager'))]" />
     <field name="arch" type="xml">
         <div name="button_box" position="inside">
-            <button name="show_sale_orders"
+            <button
+                name="show_sale_orders"
                 type="object"
                 class="oe_stat_button"
                 icon="fa-pencil-square-o"
                 attrs="{'invisible': [('sale_count', '=', 0)]}">
-                <field name="sale_count" widget="statinfo" string="Sale Orders"/>
+                <field name="sale_count" widget="statinfo" string="Sale Orders" />
             </button>
         </div>
     </field>
 </record>
--->
 
 <record id="view_move_form" model="ir.ui.view">
     <field name="name">sale_usability.account.move.form</field>