+=item cust_bill
+
+See L<FS::FeeOrigin_Mixin/cust_bill>. This version simply returns the event
+object if the event is an invoice event.
+
+=cut
+
+sub cust_bill {
+ my $self = shift;
+ my $object = $self->cust_event->cust_X;
+ if ( $object->isa('FS::cust_bill') ) {
+ return $object;
+ } else {
+ return '';
+ }
+}
+
+=item cust_pkg
+
+See L<FS::FeeOrigin_Mixin/cust_bill>. This version simply returns the event
+object if the event is a package event.
+
+=cut
+
+sub cust_pkg {
+ my $self = shift;
+ my $object = $self->cust_event->cust_X;
+ if ( $object->isa('FS::cust_pkg') ) {
+ return $object;
+ } else {
+ return '';
+ }
+}
+
+=back
+
+=cut
+
+sub _upgrade_schema {
+ my ($class, %opts) = @_;
+
+ my $sql = '
+ DELETE FROM cust_event_Fee WHERE NOT EXISTS
+ ( SELECT 1 FROM cust_event WHERE cust_event.eventnum = cust_event_fee.eventnum )
+ ';
+
+ my $sth = dbh->prepare($sql) or die dbh->errstr;
+ $sth->execute or die $sth->errstr;
+ '';
+}
+