Use the Sample XML to generate the required XML files.

<?xml version="1.0" encoding="utf-16"?>
<Documents xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <InvoiceData>
    <Header Title="Sample Invoice" InvoiceType="Invoice" />
    <IdFields>
      <InvoiceDate DisplayName="Invoice date">2021-02-02</InvoiceDate>
      <InvoiceNumber DisplayName="Invoice number">01</InvoiceNumber>
    </IdFields>
    <Buyer Title="Buyer">
      <Name DisplayName="Name">Sample Buyer</Name>
      <EMail DisplayName="Email">testsupplier@testinvoice.com</EMail>
    </Buyer>
    <Supplier Title="Supplier">
      <Name DisplayName="Name">Sample Supplier</Name>
	  <EMail DisplayName="Email">testsupplier@testinvoice.com</EMail>
    </Supplier>
    <InvoiceFields Title="" DisplayDataColumnsCount="2">
      <InvoiceDueDate DisplayName="Invoice due date">2021-02-02</InvoiceDueDate>
      <InvoiceTotalVatRatePercent DisplayName="Tax rate percent">12.00</InvoiceTotalVatRatePercent>
      <InvoiceOrderNumber DisplayName="Invoice order number">ORDER#1</InvoiceOrderNumber>
      <AmountRounding DisplayName="AmountRounding">0.29</AmountRounding>
    </InvoiceFields>
	<LineItems Title="No of rows: 1">
      <LineItem>
        <LIT_RowIdentifier DisplayName="Row id" Alignment="Center">1</LIT_RowIdentifier>
        <LIT_ArticleIdentifier DisplayName="Identifier" Alignment="Left">Article1</LIT_ArticleIdentifier>
        <LIT_ArticleName DisplayName="Description" Alignment="Left">Consignment#1</LIT_ArticleName>
        <LIT_OrderNumber DisplayName="Order no" Alignment="Center">ORDER#1</LIT_OrderNumber>
        <LIT_DeliveredQuantity DisplayName="Quantity" Alignment="Center">1</LIT_DeliveredQuantity>
        <LIT_DeliveredQuantityUnitCode DisplayName="Unit of measure" Alignment="Center">QTY#1</LIT_DeliveredQuantityUnitCode>
        <LIT_UnitPriceAmount DisplayName="Unit price" Alignment="Right">10</LIT_UnitPriceAmount>
        <LIT_VatRate DisplayName="Tax %" Alignment="Center">12.00</LIT_VatRate>
        <LIT_DiscountPercent DisplayName="Discount %" Alignment="Center">20</LIT_DiscountPercent>
        <LIT_DiscountAmount DisplayName="Discount" Alignment="Right">2.00</LIT_DiscountAmount>
        <LIT_VatExcludedAmount DisplayName="Amount excluding Tax" Alignment="Right">8.00</LIT_VatExcludedAmount>
      </LineItem>	  
    </LineItems>
	<Attachments Title="XML attachments">
      <Attachment>
        <Id DisplayName="Id">2994893.pdf.7655320.20180207_142027_068.pdf</Id>
        <Filename DisplayName="File name">17.pdf</Filename>
        <DataType DisplayName="Data type">Base64</DataType>
        <EmbeddedValueInfo DisplayName="Embedded value info">EmbeddedValueInfo = 17916</EmbeddedValueInfo>
        <AdditionalInfo DisplayName="Additional info">application/pdf</AdditionalInfo>
      </Attachment>
    </Attachments>
    <Notes Title="Invoice note">
      <InvoiceNote DisplayName="Invoice note">Test Invoice Note</InvoiceNote>
    </Notes>
    <Footer>
      <SupplierVATRegistrationNumber DisplayName="Tax code">TESTSUPPLIER-VAT-REGNUM</SupplierVATRegistrationNumber>
      <SupplierAccountNumber1 DisplayName="Supplier account">SUPPLIER_ACCT_NUMBER_123456</SupplierAccountNumber1>
      <Address DisplayName="Address">1-2-3-4, street, city, india</Address>
    </Footer>
  </InvoiceData>
</Documents>