How to handle new point of Taxation rules in Zoho

How to handle new point of Taxation rules in Zoho

I just started using Zoho invoice for invoicing my customers on services I offer. But with the new Point of Taxation rules http://www.simpletaxindia.org/2011/04/point-of-taxation-rules-2011-analysis.html things seems be be getting a little complicated.

Now since the service tax is now payable at the time of invoicing, we are required to create a proforma invoice, send the proforma invoice, collect payment and then issue the final invoice (or Tax invoice) to our customer. I would like to know how do I handle such a scenario in Zoho Invoice.