Here you can put in your tax Key´s for the 
value-added-tax.

Additionally to the normal keys of a dialog-box you can
close this box with <ESC>. The <RETURN>-key (on the
numeric-keyboard, too) has two different functions. At
first it works like the <TAB> key. The "Entry" button will
be framed simple. If you are in the text-field, this
button is framed double. Now the <RETURN> key executes
the entry.

The Dialog box doesn´t close after executing an entry. So
you can enter  many entries, one by one. You close the box
by using the "Cancel" button. All values which stay in the
mask will be deleted in this moment.