my %base_invnums; # invnum => invoice date
foreach ($cust_bill_pkg->cust_bill_pkg_fee) {
if ($_->base_invnum) {
+ # XXX what if base_bill has been voided?
my $base_bill = FS::cust_bill->by_key($_->base_invnum);
my $base_date = $self->time2str_local('short', $base_bill->_date)
if $base_bill;