my $taxzone_id = ref $taxzone && $taxzone->isa('SL::DB::TaxZone') ? $taxzone->id : $taxzone;
my $taxzone_chart = SL::DB::Manager::TaxzoneChart->find_by(taxzone_id => $taxzone_id, buchungsgruppen_id => $self->id);
return $taxzone_chart->expense_accno_id if $taxzone_chart;
my $taxzone_id = ref $taxzone && $taxzone->isa('SL::DB::TaxZone') ? $taxzone->id : $taxzone;
my $taxzone_chart = SL::DB::Manager::TaxzoneChart->find_by(taxzone_id => $taxzone_id, buchungsgruppen_id => $self->id);
return $taxzone_chart->expense_accno_id if $taxzone_chart;