+sub type {
+  goto &order_type;
+}
+
+sub is_type {
+  return shift->type eq shift;
+}
+
+sub displayable_type {
+  my $type = shift->type;
+
+  return $::locale->text('Sales Delivery Order')    if $type eq 'sales_delivery_order';
+  return $::locale->text('Purchase Delivery Order') if $type eq 'purchase_delivery_order';
+
+  die 'invalid type';
+}
+
+sub displayable_name {
+  join ' ', grep $_, map $_[0]->$_, qw(displayable_type record_number);
+};
+
+sub displayable_state {
+  my ($self) = @_;
+
+  return join '; ',
+    ($self->closed    ? $::locale->text('closed')    : $::locale->text('open')),
+    ($self->delivered ? $::locale->text('delivered') : $::locale->text('not delivered'));
+}
+
+sub date {
+  goto &transdate;
+}
+
+sub number {
+  goto &donumber;
+}
+
+sub _clone_orderitem_cvar {
+  my ($cvar) = @_;
+
+  my $cloned = $_->clone_and_reset;
+  $cloned->sub_module('delivery_order_items');
+
+  return $cloned;
+}
+
+sub new_from {
+  my ($class, $source, %params) = @_;
+
+  croak("Unsupported source object type '" . ref($source) . "'") unless ref($source) eq 'SL::DB::Order';
+
+  my ($item_parent_id_column, $item_parent_column);
+
+  if (ref($source) eq 'SL::DB::Order') {
+    $item_parent_id_column = 'trans_id';
+    $item_parent_column    = 'order';
+  }
+
+  my %args = ( map({ ( $_ => $source->$_ ) } qw(cp_id currency_id customer_id cusordnumber delivery_term_id department_id employee_id globalproject_id intnotes language_id notes
+                                                ordnumber payment_id reqdate salesman_id shippingpoint shipvia taxincluded taxzone_id transaction_description vendor_id billing_address_id
+                                             )),
+               closed    => 0,
+               delivered => 0,
+               order_type => $params{type},
+               transdate => DateTime->today_local,
+            );
+
+  # Custom shipto addresses (the ones specific to the sales/purchase
+  # record and not to the customer/vendor) are only linked from
+  # shipto → delivery_orders. Meaning delivery_orders.shipto_id
+  # will not be filled in that case.
+  if (!$source->shipto_id && $source->id) {
+    $args{custom_shipto} = $source->custom_shipto->clone($class) if $source->can('custom_shipto') && $source->custom_shipto;
+
+  } else {
+    $args{shipto_id} = $source->shipto_id;
+  }
+
+  # infer type from legacy fields if not given
+  $args{order_type} //= $source->customer_id ? 'sales_delivery_order'
+                      : $source->vendor_id   ? 'purchase_delivery_order'
+                      : $source->is_sales    ? 'sales_delivery_order'
+                      : croak "need some way to set delivery order type from source";
+
+  my $delivery_order = $class->new(%args);
+  $delivery_order->assign_attributes(%{ $params{attributes} }) if $params{attributes};
+  my $items          = delete($params{items}) || $source->items_sorted;
+  my %item_parents;
+
+  # do not copy items when converting to supplier delivery order
+  my @items = $delivery_order->is_type(SUPPLIER_DELIVERY_ORDER_TYPE) ? () : map {
+    my $source_item      = $_;
+    my $source_item_id   = $_->$item_parent_id_column;
+    my @custom_variables = map { _clone_orderitem_cvar($_) } @{ $source_item->custom_variables };
+
+    $item_parents{$source_item_id} ||= $source_item->$item_parent_column;
+    my $item_parent                  = $item_parents{$source_item_id};
+
+    my $current_do_item = SL::DB::DeliveryOrderItem->new(map({ ( $_ => $source_item->$_ ) }
+                                         qw(base_qty cusordnumber description discount lastcost longdescription marge_price_factor parts_id price_factor price_factor_id
+                                            project_id qty reqdate sellprice serialnumber transdate unit active_discount_source active_price_source
+                                         )),
+                                   custom_variables => \@custom_variables,
+                                   ordnumber        => ref($item_parent) eq 'SL::DB::Order' ? $item_parent->ordnumber : $source_item->ordnumber,
+                                 );
+    $current_do_item->{"converted_from_orderitems_id"} = $_->{id} if ref($item_parent) eq 'SL::DB::Order';
+    $current_do_item;
+  } @{ $items };
+
+  @items = grep { $params{item_filter}->($_) } @items if $params{item_filter};
+  @items = grep { $_->qty * 1 } @items if $params{skip_items_zero_qty};
+  @items = grep { $_->qty >=0 } @items if $params{skip_items_negative_qty};
+
+  $delivery_order->items(\@items);
+
+  return $delivery_order;
+}
+
+sub new_from_time_recordings {
+  my ($class, $sources, %params) = @_;
+
+  croak("Unsupported object type in sources")                                      if any { ref($_) ne 'SL::DB::TimeRecording' }            @$sources;
+  croak("Cannot create delivery order from source records of different customers") if any { $_->customer_id != $sources->[0]->customer_id } @$sources;
+
+  # - one item per part (article)
+  # - qty is sum of duration
+  # - description goes to item longdescription
+  #  - ordered and summed by date
+  #  - each description goes to an ordered list
+  #  - (as time recording descriptions are formatted text by now, use stripped text)
+  #  - merge same descriptions
+  #
+
+  my $default_part_id  = $params{default_part_id}     ? $params{default_part_id}
+                       : $params{default_partnumber}  ? SL::DB::Manager::Part->find_by(partnumber => $params{default_partnumber})->id
+                       : undef;
+  my $override_part_id = $params{override_part_id}    ? $params{override_part_id}
+                       : $params{override_partnumber} ? SL::DB::Manager::Part->find_by(partnumber => $params{override_partnumber})->id
+                       : undef;
+
+  # check parts and collect entries
+  my %part_by_part_id;
+  my $entries;
+  foreach my $source (@$sources) {
+    next if !$source->duration;
+
+    my $part_id   = $override_part_id;
+    $part_id    ||= $source->part_id;
+    $part_id    ||= $default_part_id;
+
+    die 'article not found for entry "' . $source->displayable_times . '"' if !$part_id;
+
+    if (!$part_by_part_id{$part_id}) {
+      $part_by_part_id{$part_id} = SL::DB::Part->new(id => $part_id)->load;
+      die 'article unit must be time based for entry "' . $source->displayable_times . '"' if !$part_by_part_id{$part_id}->unit_obj->is_time_based;
+    }
+
+    my $date = $source->date->to_kivitendo;
+    $entries->{$part_id}->{$date}->{duration} += $params{rounding}
+                                               ? nhimult(0.25, ($source->duration_in_hours))
+                                               : _round_total($source->duration_in_hours);
+    # add content if not already in description
+    my $new_description = '' . $source->description_as_stripped_html;
+    $entries->{$part_id}->{$date}->{content} ||= '';
+    $entries->{$part_id}->{$date}->{content}  .= '<li>' . $new_description . '</li>'
+      unless $entries->{$part_id}->{$date}->{content} =~ m/\Q$new_description/;
+
+    $entries->{$part_id}->{$date}->{date_obj}  = $source->start_time || $source->date; # for sorting
+  }
+
+  my @items;
+
+  my $h_unit = SL::DB::Manager::Unit->find_h_unit;
+
+  my @keys = sort { $part_by_part_id{$a}->partnumber cmp $part_by_part_id{$b}->partnumber } keys %$entries;
+  foreach my $key (@keys) {
+    my $qty = 0;
+    my $longdescription = '';
+
+    my @dates = sort { $entries->{$key}->{$a}->{date_obj} <=> $entries->{$key}->{$b}->{date_obj} } keys %{$entries->{$key}};
+    foreach my $date (@dates) {
+      my $entry = $entries->{$key}->{$date};
+
+      $qty             += $entry->{duration};
+      $longdescription .= $date . ' <strong>' . _format_total($entry->{duration}) . ' h</strong>';
+      $longdescription .= '<ul>';
+      $longdescription .= $entry->{content};
+      $longdescription .= '</ul>';
+    }
+
+    my $item = SL::DB::DeliveryOrderItem->new(
+      parts_id        => $part_by_part_id{$key}->id,
+      description     => $part_by_part_id{$key}->description,
+      qty             => $qty,
+      base_qty        => $h_unit->convert_to($qty, $part_by_part_id{$key}->unit_obj),
+      unit_obj        => $h_unit,
+      sellprice       => $part_by_part_id{$key}->sellprice, # Todo: use price rules to get sellprice
+      longdescription => $longdescription,
+    );
+
+    push @items, $item;
+  }
+
+  my $delivery_order;
+
+  if ($params{related_order}) {
+    # collect suitable items in related order
+    my @items_to_use;
+    my @new_attributes;
+    foreach my $item (@items) {
+      my $item_to_use = first {$item->parts_id == $_->parts_id} @{ $params{related_order}->items_sorted };
+
+      die "no suitable item found in related order" if !$item_to_use;
+
+      my %new_attributes;
+      $new_attributes{$_} = $item->$_ for qw(qty base_qty unit_obj longdescription);
+      push @items_to_use,   $item_to_use;
+      push @new_attributes, \%new_attributes;
+    }
+
+    $delivery_order = $class->new_from($params{related_order}, items => \@items_to_use, %params);
+    pairwise { $a->assign_attributes( %$b) } @{$delivery_order->items}, @new_attributes;
+
+  } else {
+    my %args = (
+      is_sales    => 1,
+      order_type  => 'sales_delivery_order',
+      delivered   => 0,
+      customer_id => $sources->[0]->customer_id,
+      taxzone_id  => $sources->[0]->customer->taxzone_id,
+      currency_id => $sources->[0]->customer->currency_id,
+      employee_id => SL::DB::Manager::Employee->current->id,
+      salesman_id => SL::DB::Manager::Employee->current->id,
+      items       => \@items,
+    );
+    $delivery_order = $class->new(%args);
+    $delivery_order->assign_attributes(%{ $params{attributes} }) if $params{attributes};
+  }
+
+  return $delivery_order;
+}
+
+# legacy for compatibility
+# use type_data cusomtervendor and transfer direction instead
+sub is_sales {
+  if ($_[0]->order_type) {
+   return SL::DB::DeliveryOrder::TypeData::get3($_[0]->order_type, "properties", "is_customer");
+  }
+  return $_[0]{is_sales};
+}
+
+sub customervendor {
+  SL::DB::DeliveryOrder::TypeData::get3($_[0]->order_type, "properties", "is_customer") ? $_[0]->customer : $_[0]->vendor;
+}
+
+sub convert_to_invoice {
+  my ($self, %params) = @_;
+
+  croak("Conversion to invoices is only supported for sales records") unless $self->customer_id;
+
+  my $invoice;
+  if (!$self->db->with_transaction(sub {
+    require SL::DB::Invoice;
+    $invoice = SL::DB::Invoice->new_from($self, %params)->post || die;
+    $self->link_to_record($invoice);
+    # TODO extend link_to_record for items, otherwise long-term no d.r.y.
+    foreach my $item (@{ $invoice->items }) {
+      foreach (qw(delivery_order_items)) {    # expand if needed (orderitems)
+        if ($item->{"converted_from_${_}_id"}) {
+          die unless $item->{id};
+          RecordLinks->create_links('mode'       => 'ids',
+                                    'from_table' => $_,
+                                    'from_ids'   => $item->{"converted_from_${_}_id"},
+                                    'to_table'   => 'invoice',
+                                    'to_id'      => $item->{id},
+          ) || die;
+          delete $item->{"converted_from_${_}_id"};
+        }
+      }
+    }
+    $self->update_attributes(closed => 1);
+    1;
+  })) {
+    return undef;
+  }
+
+  return $invoice;
+}
+
+sub digest {
+  my ($self) = @_;
+
+  sprintf "%s %s (%s)",
+    $self->donumber,
+    $self->customervendor->name,
+    $self->date->to_kivitendo;
+}
+