<record id="mt_voucher_state_change" model="mail.message.subtype">
<field name="name">Status Change</field>
<field name="res_model">account.voucher</field>
<record id="mt_voucher_state_change" model="mail.message.subtype">
<field name="name">Status Change</field>
<field name="res_model">account.voucher</field>