Use this window to enter and view details of numeration groups.
Numeration groups enable you to specify more than one number series for each customer
invoice type. 
To use a numeration group, you first connect a customer to the numeration group in the 
Customer/Invoice tab. Next, when you define
invoice types for the customer in the Customer 
Invoice Types
window, you also can define specific combinations of invoice type + numeration group +
branch, and then assign a different number series for each combination. You can delete a
numeration group only if no customer and no invoice type have been connected to it.
Specify General Customer Invoice Information