multi user in GNUCash

[Shenbaga Kumar S]

Hi
 My business requirement is as follows:
An accountant enters the expense details and should *not* be able to view
revenue details
Another accountant enters the revenues of the company and should *not* be
able to view expenses or other details
The manager should be able to view all the details as well as generate
reports
 All these three users operate in the same machine. How can I implement this
abstraction in GNUCash?

Thanks in Advance
Shenbaga Kumar