for my $transaction (@{ $datev->{DATEV} }) {
for my $entry (@{ $transaction }) {
$entry->{sortkey} = join '-', map { lc } (DateTime->from_kivitendo($entry->{transdate})->strftime('%Y%m%d'), $entry->{name}, $entry->{reference});
for my $transaction (@{ $datev->{DATEV} }) {
for my $entry (@{ $transaction }) {
$entry->{sortkey} = join '-', map { lc } (DateTime->from_kivitendo($entry->{transdate})->strftime('%Y%m%d'), $entry->{name}, $entry->{reference});