odoo_source/addons/account_check_writing/account_check_writing_data.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">
        <record forcecreate="1" id="sequence_type_check_number" model="ir.sequence.type">
            <field name="name">Check Number</field>
            <field name="code">check.number</field>
        </record>

        <record id="sequence_check_number" model="ir.sequence">
            <field name="name">Check Number</field>
            <field name="code">check.number</field>
            <field eval="4" name="padding"/>
        </record>        
    </data>
</openerp>