<field name="nationality_id" required="1" />
<field name="occupation_id" required="1" domain="[('domain','=', 'occupation')]"/>
<field name="volunteer_ids" domain="[('domain','=', 'volunteer')]" />
<field name="nationality_id" required="1" />
<field name="occupation_id" required="1" domain="[('domain','=', 'occupation')]"/>
<field name="volunteer_ids" domain="[('domain','=', 'volunteer')]" />