+my $startdate = DateTime->new(year => 2017, month => 1, day => 1);
+my $enddate = DateTime->new(year => 2017, month => 12, day => 31);
+
+# check conversion to csv
+$datev1->from($startdate);
+$datev1->to($enddate);
+
+# splice away the header, because sort won't do
+# we need sort, because pay_invoice is not acc_trans_id order safe
+my @data_csv = splice @{ $datev1->csv_buchungsexport() }, 2, 5;
+@data_csv = sort { $a->[0] <=> $b->[0] } @data_csv;
+
+my $cp1252_belegfeld1 = SL::Iconv::convert("UTF-8", "CP1252", 'Þ sales ¥& i');
+my $cp1252_buchungstext = SL::Iconv::convert("UTF-8", "CP1252", 'Þ sales ¥& invöice');
+
+cmp_bag($data_csv[1], [ 535, 'S', 'EUR', undef, undef, undef, '1400', '8300', undef, '0101', $cp1252_belegfeld1,
+ undef, undef, $cp1252_buchungstext, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, 'Crowd-Fu', 'Kostenst', undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef ]
+ );
+
+cmp_bag($data_csv[0], [ '249,9', 'S', 'EUR', undef, undef, undef, '1400', '8400', undef, '0101', $cp1252_belegfeld1,
+ undef, undef, $cp1252_buchungstext, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, 'Crowd-Fu', 'Kostenst', undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef ]
+ );
+cmp_bag($data_csv[2], [ '784,9', 'S', 'EUR', undef, undef, undef, '1200', '1400', undef, '0501', $cp1252_belegfeld1,
+ undef, undef, $cp1252_buchungstext, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, 'Crowd-Fu', 'Kostenst', undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef,
+ undef, undef, undef, undef, undef ]
+ );
+my $march_9 = DateTime->new(year => 2017, month => 3, day => 9);
+my $invoice2 = create_sales_invoice(