Obowiązkowe pola wystawionej faktury XML

<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2"
  xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2"
  xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2">
  <cbc:CustomizationID>urn:cen.eu:en16931:2017#compliant#urn:fdc:peppol.eu:2017:poacc:billing:3.0</cbc:CustomizationID>
  <cbc:ProfileID>urn:fdc:peppol.eu:2017:poacc:billing:01:1.0</cbc:ProfileID>
  <cbc:ID>{{invoice_number}}</cbc:ID>
  <cbc:IssueDate>{{YYYY-MM-DD}}</cbc:IssueDate>
  <cbc:DueDate>{{YYYY-MM-DD}}</cbc:DueDate>
  <cbc:InvoiceTypeCode>380</cbc:InvoiceTypeCode>
  <cbc:DocumentCurrencyCode>EUR</cbc:DocumentCurrencyCode>
  <cbc:BuyerReference>{{buyer_reference}}</cbc:BuyerReference>

  <cac:AccountingSupplierParty>
    <cac:Party>
      <cbc:EndpointID schemeID="0245">{{seller_DIC_without_SK}}</cbc:EndpointID>
      <cac:PostalAddress>
        <cbc:StreetName>{{street}}</cbc:StreetName>
        <cbc:CityName>{{city}}</cbc:CityName>
        <cbc:PostalZone>{{postal_code}}</cbc:PostalZone>
        <cac:Country><cbc:IdentificationCode>SK</cbc:IdentificationCode></cac:Country>
      </cac:PostalAddress>
      <cac:PartyTaxScheme>
        <cbc:CompanyID>{{seller_IC_DPH}}</cbc:CompanyID>
        <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
      </cac:PartyTaxScheme>
      <cac:PartyLegalEntity>
        <cbc:RegistrationName>{{seller_name}}</cbc:RegistrationName>
        <cbc:CompanyID schemeID="0158">{{seller_ICO}}</cbc:CompanyID>
      </cac:PartyLegalEntity>
    </cac:Party>
  </cac:AccountingSupplierParty>

  <cac:AccountingCustomerParty>
    <cac:Party>
      <cbc:EndpointID schemeID="0245">{{buyer_DIC_without_SK}}</cbc:EndpointID>
      <!-- adres, identyfikator VAT i PartyLegalEntity analogicznie jak dla dostawcy -->
    </cac:Party>
  </cac:AccountingCustomerParty>

  <cac:PaymentMeans>
    <cbc:PaymentMeansCode>30</cbc:PaymentMeansCode>
    <cbc:PaymentID>{{payment_reference}}</cbc:PaymentID>
    <cac:PayeeFinancialAccount><cbc:ID>{{IBAN}}</cbc:ID></cac:PayeeFinancialAccount>
  </cac:PaymentMeans>

  <cac:TaxTotal>
    <cbc:TaxAmount currencyID="EUR">{{VAT_total}}</cbc:TaxAmount>
    <cac:TaxSubtotal>
      <cbc:TaxableAmount currencyID="EUR">{{tax_base}}</cbc:TaxableAmount>
      <cbc:TaxAmount currencyID="EUR">{{VAT_amount}}</cbc:TaxAmount>
      <cac:TaxCategory>
        <cbc:ID>S</cbc:ID>
        <cbc:Percent>23</cbc:Percent>
        <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
      </cac:TaxCategory>
    </cac:TaxSubtotal>
  </cac:TaxTotal>

  <cac:LegalMonetaryTotal>
    <cbc:LineExtensionAmount currencyID="EUR">{{BT-106}}</cbc:LineExtensionAmount>
    <cbc:TaxExclusiveAmount currencyID="EUR">{{BT-109}}</cbc:TaxExclusiveAmount>
    <cbc:TaxInclusiveAmount currencyID="EUR">{{BT-112}}</cbc:TaxInclusiveAmount>
    <cbc:PayableAmount currencyID="EUR">{{BT-115}}</cbc:PayableAmount>
  </cac:LegalMonetaryTotal>

  <cac:InvoiceLine>
    <cbc:ID>1</cbc:ID>
    <cbc:InvoicedQuantity unitCode="C62">{{quantity}}</cbc:InvoicedQuantity>
    <cbc:LineExtensionAmount currencyID="EUR">{{line_net}}</cbc:LineExtensionAmount>
    <cac:Item>
      <cbc:Name>{{item_name}}</cbc:Name>
      <cac:ClassifiedTaxCategory>
        <cbc:ID>S</cbc:ID><cbc:Percent>23</cbc:Percent>
        <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
      </cac:ClassifiedTaxCategory>
    </cac:Item>
    <cac:Price><cbc:PriceAmount currencyID="EUR">{{unit_net_price}}</cbc:PriceAmount></cac:Price>
  </cac:InvoiceLine>
</Invoice>