=item primary_svc - primary flag, empty or 'Y'
+=item hidden - 'Y' to hide this service on invoices, null otherwise.
+
=back
=head1 METHODS
|| $self->ut_number('pkgpart')
|| $self->ut_number('svcpart')
|| $self->ut_number('quantity')
+ || $self->ut_enum('hidden', [ '', 'Y' ] )
;
return $error if $error;