+=item total_owed_pkgnum PKGNUM
+
+Returns the total owed on all invoices for this customer's specific package
+when using experimental package balances (see L<FS::cust_bill/owed_pkgnum>).
+
+=cut
+
+sub total_owed_pkgnum {
+ my( $self, $pkgnum ) = @_;
+ $self->total_owed_date_pkgnum(2145859200, $pkgnum); #12/31/2037
+}
+
+=item total_owed_date_pkgnum TIME PKGNUM
+
+Returns the total owed for this customer's specific package when using
+experimental package balances on all invoices with date earlier than
+TIME. TIME is specified as a UNIX timestamp; see L<perlfunc/"time">). Also
+see L<Time::Local> and L<Date::Parse> for conversion functions.
+
+=cut
+
+sub total_owed_date_pkgnum {
+ my( $self, $time, $pkgnum ) = @_;
+
+ my $total_bill = 0;
+ foreach my $cust_bill (
+ grep { $_->_date <= $time }
+ qsearch('cust_bill', { 'custnum' => $self->custnum, } )
+ ) {
+ $total_bill += $cust_bill->owed_pkgnum($pkgnum);
+ }
+ sprintf( "%.2f", $total_bill );
+
+}
+