<?xml version="1.0"?>
<data><filter name="assigned" position="attributes">
          <attribute name="domain">['|', ('employee_id', '!=', False), ('department_id', '!=', False)]</attribute>
        </filter>
        <filter name="available" position="attributes">
          <attribute name="domain">[('employee_id', '=', False), ('department_id', '=', False)]</attribute>
        </filter>
        <field name="owner_user_id" position="after">
          <field name="employee_id"/>
          <field name="department_id"/>
        </field>
        <group position="inside">
          <filter string="Employee" name="employee" domain="[]" context="{'group_by': 'employee_id'}"/>
          <filter string="Department" name="department" domain="[]" context="{'group_by': 'department_id'}"/>
        </group>
      </data>