Rusalina

Could you please help me with the following xml "template"? Why is giving me error when I try to export it? It says "Cannot save or export XML data. The XML maps in this workbook are not exportable.". I couldn't find similar case. My idea is to make a phonebook for IP phones and there contacts to be in different groups but export is failing. Could you please advice how to fix it as to be able to export? 

<?xml version="1.0" encoding="UTF-8"?>
<IPPhoneBook>
  <Title>Yealink</Title>
  <Menu Name="Department1">
    <Unit Name="Stan" Phone1="123" Phone2="088123" Phone3="089123"/>
    <Unit Name="Ivan Asenov" Phone1="321" Phone2="088321" Phone3="089321"/>
  </Menu>
  <Menu Name="Department2">
    <Unit Name="Asen" Phone1="789" Phone2="088789" Phone3="089789"/>
    <Unit Name="Boril" Phone1="987" Phone2="088987" Phone3="088987"/>
  </Menu>
</IPPhoneBook>

Thanks in advance.