two methods in AdminOrderProduct.class is missing in OrderProduct.class

[Sony George]

when an oder is placed i need to send the invoice and packing slip to an email id , for this in OrderIntegrationMgr.java
i used velocity template OrderInvoice_em.vm. but two methods
getTotalPriceExTax() and getTotalPriceIncTax() which are in AdminOrderProduct.class
are missing in OrderProduct.class, so i am not able to create the template...

any work around

regards