{ title => t8('Purchase delivery order'), type => 'purchase_delivery_order', model => 'DeliveryOrder', number => 'donumber', },
{ title => t8('Purchase Invoice'), type => 'purchase_invoice', model => 'PurchaseInvoice', number => 'invnumber', },
{ title => t8('Letter'), type => 'letter', model => 'Letter', number => 'letternumber', description => 'subject', description_title => t8('Subject'), date => 'date', project => undef },
+ { title => t8('Email'), type => 'email_journal', model => 'EmailJournal', number => 'id', description => 'subject', description_title => t8('Subject'), },
);
my @link_types = map { +{ %link_type_defaults, %{ $_ } } } @link_type_specifics;