Agrega un nuevo campo cobrador en account voucher.

views/account_voucher_view.xml

@@ -31,10 +31,10 @@
             <field name="arch" type="xml">
               <search>
                   <field name="employee_id"/>
-                  <separator/>
+                  <!-- <separator/>
                   <group string="Agrupar por">
                       <filter string="Cobrador" context="{'group_by':'employee_id'}"/>
-                  </group>
+                  </group> -->
                </search>
             </field>
         </record>