The Reporting Integration enables the End User to pass the ‘Where clause’ (or current/selected/all record set) to the External Reporting System – without leaving Maximo.
In general in order to make ERI work you need to add system properties and create a JSP page to be executed when a report is requested. This is usually customreport.jsp, which can be found (in default installation)in this directory:C:\IBM\SMP\maximo\applications\maximo\maximouiweb\webmodule\webclient\utility.
Attached is a sample customreport.jsp.
For more details check out this wiki page - http://www.birt-exchange.org/org/wiki/index.php?title=Using_Actuate_BIRT_and_IBM_Maximo