bank-payment/account_banking_mandate/data/mandate_reference_sequence.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra noupdate="1">


<record id="dd_mandate_seq" model="ir.sequence">
    <field name="name">DD Mandate Reference</field>
    <field name="code">account.banking.mandate</field>
    <field name="prefix">BM</field>
    <field name="padding" eval="7"/>
</record>


</flectra>