my %lines = ();
my %usage_class = map { $_->classnum => $_ } qsearch( 'usage_class', {} );
+ $usage_class{''} ||= new FS::usage_class { 'classname' => '', 'weight' => 0 };
foreach my $cust_bill_pkg ( $self->cust_bill_pkg ) {
next unless $cust_bill_pkg->pkgnum > 0;