我试着用Mustang库创建一个factur-x，我发现了如何创建一个EN16931 factur-x xml以及如何将其嵌入到pdf中。
为此，我使用了以下代码示例：

ZUGFeRDExporterFromA1 ze = new ZUGFeRDExporterFromA1().setProducer("My Application")
          .setCreator(System.getProperty("user.name")).setZUGFeRDVersion(2).ignorePDFAErrors()
          .load("blanko.pdf");
Invoice i = new Invoice()
          .setIssueDate(new Date())
          .setDueDate(new Date())
          .setDetailedDeliveryPeriod(new Date(), new Date())
          .setDeliveryDate(new Date())
          .setSender(
                  new TradeParty("ME", "teststr", "55232", "teststadt", "DE")
                          .addTaxID("4711")
                          .addVATID("DE0815")
                          .addBankDetails(new BankDetails("DE88200800000970375700", "COBADEFFXXX")))
          .setRecipient(
                  new TradeParty("Franz Müller", "teststr.12", "55232", "Entenhausen", "DE")
                          .addVATID("DE0815"))
          .setNumber("NUMFACTURE")
          .addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(19)), new BigDecimal(123), new BigDecimal(1)))
          .addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(19)), new BigDecimal(123), new BigDecimal(1)))
          .addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(19)), new BigDecimal(123), new BigDecimal(1)))
          .setCreditNote();
      ze.setTransaction(i);
      ze.export("factur-x-en16931.pdf");

这个代码工作正常。我生成一个有效的PDF与有效的XML数据...我的问题是关于较低的facturx水平，如最低，基本，基本的wl。
XML应如下所示：

<?xml version='1.0' encoding='UTF-8'?>
<rsm:CrossIndustryInvoice 
    xmlns:qdt="urn:un:unece:uncefact:data:standard:QualifiedDataType:100"
    xmlns:ram="urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100"
    xmlns:rsm="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100"
    xmlns:udt="urn:un:unece:uncefact:data:standard:UnqualifiedDataType:100"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <rsm:ExchangedDocumentContext>
      <ram:BusinessProcessSpecifiedDocumentContextParameter>
         <ram:ID>A1</ram:ID>
      </ram:BusinessProcessSpecifiedDocumentContextParameter>
      <ram:GuidelineSpecifiedDocumentContextParameter>
         <ram:ID>urn:factur-x.eu:1p0:minimum</ram:ID>
      </ram:GuidelineSpecifiedDocumentContextParameter>
   </rsm:ExchangedDocumentContext>
   <rsm:ExchangedDocument>
      <ram:ID>NUMFCADNO22</ram:ID>
      <ram:TypeCode>380</ram:TypeCode>
      <ram:IssueDateTime>
         <udt:DateTimeString format="102">20220506</udt:DateTimeString>
      </ram:IssueDateTime>
   </rsm:ExchangedDocument>
   <rsm:SupplyChainTradeTransaction>
      <ram:ApplicableHeaderTradeAgreement>
         <ram:SellerTradeParty>
            <ram:Name>ACME</ram:Name>
            <ram:SpecifiedLegalOrganization>
               <ram:ID schemeID="0002">3810011234560073</ram:ID>
            </ram:SpecifiedLegalOrganization>
            <ram:PostalTradeAddress>
               <ram:CountryID>FR</ram:CountryID>
            </ram:PostalTradeAddress>
            <ram:SpecifiedTaxRegistration>
               <ram:ID schemeID="VA">FR17143232666</ram:ID>
            </ram:SpecifiedTaxRegistration>
         </ram:SellerTradeParty>
         <ram:BuyerTradeParty>
            <ram:Name>Client</ram:Name>
         </ram:BuyerTradeParty>
      </ram:ApplicableHeaderTradeAgreement>
      <ram:ApplicableHeaderTradeDelivery/>
      <ram:ApplicableHeaderTradeSettlement>
         <ram:InvoiceCurrencyCode>EUR</ram:InvoiceCurrencyCode>
         <ram:SpecifiedTradeSettlementHeaderMonetarySummation>
            <ram:TaxBasisTotalAmount>200.00</ram:TaxBasisTotalAmount>
            <ram:TaxTotalAmount currencyID="EUR">40.00</ram:TaxTotalAmount>
            <ram:GrandTotalAmount>240.00</ram:GrandTotalAmount>
            <ram:DuePayableAmount>240.00</ram:DuePayableAmount>
         </ram:SpecifiedTradeSettlementHeaderMonetarySummation>
      </ram:ApplicableHeaderTradeSettlement>
   </rsm:SupplyChainTradeTransaction>
</rsm:CrossIndustryInvoice>

我的问题是，我有问题创建这样的附加文档。在这里，我需要设置：

• 发布日期时间
• 卖方名称（但构造方需要所有信息）
• 卖方增值税ID
• 买方名称
• 货币
• 共计
• 计税基础总额
• 纳税总额
• 总额
• 到期应付金额

我知道了部分侧写设置方法。

ZUGFeRDExporterFromA1 ze = new ZUGFeRDExporterFromA1()
      .setProducer("My Application")
      .setCreator(System.getProperty("user.name"))
      .setZUGFeRDVersion(2)
      .setProfile("MINIMUM")
      .ignorePDFAErrors()
      .load("blanko.pdf");

我有关于定义发票详细信息的问题：

Invoice i = new Invoice()
            .setIssueDate(new Date())                                                                                   
            // .setDueDate(new Date()) ==> not required
            // .setDetailedDeliveryPeriod(new Date(), new Date()) ==> not required
            // .setDeliveryDate(new Date()) ==> not required
            .setSender(
                    new TradeParty("ACME", "", "", "", "FR")
                            .addVATID("FR17143232666"))
            .setRecipient(
                    new TradeParty("Client test MOA", "", "", "", "")
                            .addVATID("DE0815"))
            .setNumber("NUMFACTURE")
            .setCurrency("EUR")
            .setTotalPrepaidAmount(new BigDecimal("450.00"));
        ze.setTransaction(i);
        ze.export("factur-x-min.pdf");

我没有找到如何在Mustang中设置必需元素的值，例如，我有关于日期的空指针异常。