partner-contact/base_partner_sequence/partner_sequence.xml

<?xml version="1.0"?>
<openerp>
<data noupdate="1">

	#
	# Sequences for res.partner
	#

	<record model="ir.sequence.type" id="seq_type_res_partner">
		<field name="name">Partner code</field>
		<field name="code">res.partner</field>
	</record>
	<record model="ir.sequence" id="seq_res_partner">
		<field name="name">Partner code</field>
		<field name="code">res.partner</field>
		<field name="prefix">P/</field>
		<field name="padding">5</field>
	</record>

</data>
</openerp>