=over 4
-=item previous_balance
+=item billing_balance - the customer's balance at the time the invoice was
+generated (not including charges on this invoice)
-=item billing_balance
+=item previous_balance - the billing_balance of this customer's previous
+invoice plus the charges on that invoice
=back
$self->custnum,
$cust_main->first,
$cust_main->last,
+ $cust_main->company,
$cust_main->address1,
$cust_main->address2,
$cust_main->city,