To Create procurements based on quantity ordered in openerp-9 If the quantity is increased and new procurements are created then use this code given below in .py file

def _action_procurement_create(self):
        precision = self.env['decimal.precision'].precision_get('Product Unit of Measure')
        new_procs = self.env['procurement.order'] #Empty recordset
        for line in self:
            if line.state != 'sale':
                continue
            qty = 0.0
            for proc in line.procurement_ids:
                qty += proc.product_qty
            if float_compare(qty, line.product_uom_qty, precision_digits=precision) >= 0:
                return False

            if not line.order_id.procurement_group_id:
                vals = line.order_id_prepare_procurement_group()
                line.order_id.procurement_group_id = self.env["procurement.group"].create(vals)

            vals = line_prepare_order_line_procurement(group_id=line.order_id.procurement_group_id.id)
            vals['product_qty'] = line.product_uom_qty - qty
            new_proc = self.env["procurement.order"].create(vals)
            new_procs += new_proc
        new_procs.run()
        return new_procs