ID: mint_system.hr_holidays_delegations.hr_leave_view_form_inherit.delegate_groups
<?xml version="1.0"?>
<data inherit_id="hr_holidays_delegations.hr_leave_view_form_inherit" priority="50">
<xpath expr="//p[@name='delegate_employee_id']" position="replace">
<field name="delegate_employee_id" groups="hr_holidays.group_hr_holidays_responsible" options="{'no_create': 1, 'no_open': 1}" domain="[('user_id', '!=', False), ('id', '!=', employee_id)]"/>
</xpath>
</data>
Source: snippets/hr_holidays_delegations.hr_leave_view_form_inherit.delegate_groups.xml