XMLPUB - Invoice template modification for adding additional page at the front

Hi All,

          I have a requirement to add a start up page in the invoice template where i need to add a envelope page before the invoice gets printed. GSCM 9.1 with PT 8.52. XMLPUB report definition "BI_PRNXPN01".

 Here is my expectation;

First Page need to be added which would contain the envelope details for the invoice

From second Page the regular Invoice template must begin.

Can i modify the RTF template "BI_PRNXPN01" to satisfy the above requirement? This is for the purpose of printing invoice and sending to target system which will make use of the printed invoice for Mailing purpose which would hold the envelope which is printed in the first page.