More than two tax levels

[Markus Schiltknecht <..hidden..>]

Hi,

besides trying to upgrade, I'm having a problem with the current 
ledger-smb 1.1.9:

In Germany, the higher taxes have just raised even higher, from 16 to 19 
percent. (The lower level one for food, books, etc.. remained at 7%). 
That began on January, 1st 2007. Leaving out the question of what level 
applies when, let me just tell you that it's possible to receive 
invoices which have all the three tax levels in them.

Now, can I somehow add a third tax level (instead of simply changing the 
existing one)? And add the appropriate additional accounts for these taxes?

Regards

Markus