odoo_source/addons/purchase_requisition/purchase_requisition_data.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">
	<function
            eval="('default',False,'warehouse_id', [('purchase.requisition', False)], ref('stock.warehouse0'), True, False, False, False, True)"
            id="purchase_default_set"
            model="ir.values"
            name="set"/>
    </data>
</openerp>