stock_warehouse_transfer/data/ir_sequence.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record id="stock_warehouse_transfer_ir_seq_type" model="ir.sequence.type">
            <field name="name">Stock Warehouse Transfer</field>
            <field name="code">stock.warehouse.transfer</field>
        </record>

        <record id="stock_warehouse_transfer_ir_sequence" model="ir.sequence">
            <field name="name">Stock Warehouse Transfer</field>
            <field name="code">stock.warehouse.transfer</field>
            <field name="prefix">SWT</field>
            <field name="padding">5</field>
            <field name="company_id" eval="False"/>
        </record>
        
    </data>
</openerp>