jbiling i snot a simple billing system
it is a strong one , but it is not an ERP , there is no accounting
but it is quite flexible you can extend it and develop plugins that
cover your need
Thank you for reply,
Billing system is not an accounting system, it just generating a bill for such a product, services etc...and that i can do it very easy. but what i need is accounting system, so do you know any good open source developed in J2EE accounting software for Enterprise which not http://ofbiz.apache.org/ according to your experience.