l10n_it_withholding_tax_payment/data/sequence.xml
<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data noupdate="1">
<!-- Sequences for realte -->
<record id="seq_type_wt_move_payment" model="ir.sequence.type">
<field name="name">Withholding Tax Move Payment Number</field>
<field name="code">withholding.tax.move.payment</field>
</record>
<record id="seq_wt_move_payment" model="ir.sequence">
<field name="name">Withholding Tax Move Payment Number</field>
<field name="code">withholding.tax.move.payment</field>
<!-- <field name="prefix"></field> -->
<!-- <field name="padding"></field> -->
<field eval="4" name="padding"/>
<field name="prefix">WTMP/</field>
<field name="company_id" eval="False"/>
</record>
</data>
</openerp>