>Bhavbhuti, for accounts you don't need a separate hierarchical method as the number itself has the hierarchy. If you add another hierachical layer then you are complicating the problem.
>In fact sometimes it can be a pain when the accounting tree grows, as each level is capable of only 10 sublevels. If you don't plan well it can limit you (I have about 15 years in accounting experience); you can rewrite the tree, but it breaks backward compatibility (something many accountants don't care about because they break the books every year).

They do restart the books, but they don't have to restart the accounts. I've taught my customers' accountants to keep the accounts to the detail (except those they wanted to change), because then they get the automatic rollover, i.e. initial state from the previous year, plus a long term history for each account, because I've enabled the "peek into previous years". They loved it... and thought twice before being inventive with their account scheme. But when they learned how to use it, they saw what a powerful tool they got.

And this was more than a dozen years ago.