invoice_extra.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <report 
            id="report_extra_invoice"
            string="Nombre: Factura Original"
            model="account.invoice" 
            report_type="qweb-pdf"
            file="bts.report_invoice_extra" 
            name="bts.report_invoice_extra" 
    attachment_use="False"
            attachment="(object.state in ('open','paid')) and ('FACTORG'+(object.number or '').replace('/','')+'.pdf')"

        />
     <report 
            id="report_extra_invoice_2"
            string="Nombre: Copia de Factura"
            model="account.invoice" 
            report_type="qweb-pdf"
            file="bts.report_invoice_extra_2" 
            name="bts.report_invoice_extra_2" 
    attachment_use="False"
            attachment="(object.state in ('open','paid')) and ('FACTCP'+(object.number or '').replace('/','')+'.pdf')"

        />

    </data>
</openerp>