InvoceXpress Client Create Invoce does not accept item tax.

client_create_invoice_with_tax

require 'uri'
require 'net/https'
require 'ostruct'
require 'rubygems'
require 'yaml'

  invoicexpressyml ||= YAML.load_file("config/invoicexpress.yml")
  invoicexpresscfg = invoicexpressyml["development"]
  host = [invoicexpresscfg["screen_name"], invoicexpresscfg["host"]].join(".")
  api_key = invoicexpresscfg["api_key"]


create_invoice_data = <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<invoice>
  <date>#{Time.now.strftime("%D")}</date>
  <due_date>#{Time.now.strftime("%D")}</due_date>
  <observations>some observations</observations>
  <items type="array">
    <item>
      <name>some name</name>
      <description>some description</description>
      <unit_price>123</unit_price>
      <quantity>1.0</quantity>
      <unit>unit</unit>
      <tax>
        <name>VAT23</name>
      </tax>
    </item>
  </items>
</invoice>
EOF


http = Net::HTTP.new(host, 443)
http.use_ssl = true

headers = {
  'Content-Type' => 'application/xml; charset=utf-8',
  'Accept' => 'text/plain'
}

@client_id = 284262
res = http.post("/clients/#{@client_id}/create/invoice.xml?api_key=#{api_key}", create_invoice_data, headers)
case res
when Net::HTTPSuccess, Net::HTTPRedirection
  puts res.body
  else
  puts res.to_ary[1]
end