<xs:element name="Header" >
  <xs:annotation>
    <xs:documentation>Header, userd for control purposes</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:element minOccurs="0" ref="documentID"/>
      <xs:element name="invoiceType" type="xs:string">
        <xs:annotation>
          <xs:documentation>Type of Invoice - Proforma, Final, Debit Note, or Credit Note</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element ref="status"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>