+sub date {
+  goto &transdate;
+}
+
+sub _clone_orderitem_cvar {
+  my ($cvar) = @_;
+
+  my $cloned = Rose::DB::Object::Helpers::clone_and_reset($_);
+  $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 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
+                                             )),
+               closed    => 0,
+               is_sales  => !!$source->customer_id,
+               delivered => 0,
+               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. Therefore we have to return the
+  # new shipto object as a separate object so that the caller can
+  # save it, too.
+  my $custom_shipto;
+  if (!$source->shipto_id && $source->id) {
+    my $old = $source->custom_shipto;
+    if ($old) {
+      $custom_shipto = SL::DB::Shipto->new(
+        map  { +($_ => $old->$_) }
+        grep { !m{^ (?: itime | mtime | shipto_id | trans_id ) $}x }
+        map  { $_->name }
+        @{ $old->meta->columns }
+      );
+      $custom_shipto->module('DO');
+    }
+
+  } else {
+    $args{shipto_id} = $source->shipto_id;
+  }
+
+  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;
+
+  my @items = 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};
+
+    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,
+                                 );
+
+  } @{ $items };
+
+  @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, $custom_shipto);
+}
+
+sub customervendor {
+  $_[0]->is_sales ? $_[0]->customer : $_[0]->vendor;
+}
+