Adding Attachment in XML adds unexpected XML Tags that create Validation Error (BR-55)

[xgwslbe]

Hi,

Issue:

we are currently working with the latest Version 2.16.3 and try to add an attachment to an existing XRechnung (3.0.2) or Factur-X Extended (1.0.7).

If we do so, the Mustang Library adds unexpected XML Tags inside of the ApplicableHeaderTradeSettlement Tag:

<ram:InvoiceReferencedDocument>
  <ram:IssuerAssignedID/>
</ram:InvoiceReferencedDocument>

This leads to validation Errors with the Mustang Validator, because it violates the BR-55:

• [BR-55]-Each Preceding Invoice reference (BG-3) shall contain a Preceding Invoice reference (BT-25). [ID FX-SCH-A-000182] from /xslt/ZF_232/FACTUR-X_EXTENDED.xslt)

Are we doing something wrong?

FYI: We are working with base64, because of a legacy application, I just stripped the code from the current application.

Expected behaviour:

No additional InvoiceReferencedDocument, because we attach some additional information not an invoice correction e.g.

Steps/Code to reproduce:

import java.nio.charset.StandardCharsets;
import java.text.ParseException;
import org.mustangproject.FileAttachment;
import org.mustangproject.Invoice;
import org.mustangproject.ZUGFeRD.ZUGFeRD2PullProvider;
import org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter;
import org.mustangproject.ZUGFeRD.Profiles;
import java.util.Base64;
import javax.xml.xpath.XPathExpressionException;

public class MustangApiApplication {
	public static void main(String[] args) throws XPathExpressionException, ParseException {
		String base64Xml = ""; // USE AN OFFICIAL FACTUR-X SAMPLE AS BASE64
		byte[] xml = Base64.getDecoder().decode(base64Xml);
		String profile = "Extended";

		// Attach additional files to XML
		ZUGFeRDInvoiceImporter importer = new ZUGFeRDInvoiceImporter();
		importer.fromXML(new String(xml, StandardCharsets.UTF_8));
		Invoice invoice = importer.extractInvoice();

		FileAttachment attachment = new FileAttachment("attachment.txt", "text/plain", "Attachment",
				Base64.getDecoder().decode("RGFzIGlzdCBlaW4gVGVzdA=="));
		attachment.setDescription("Attachment");
		invoice.embedFileInXML(attachment);

		ZUGFeRD2PullProvider zf2p = new ZUGFeRD2PullProvider();

		zf2p.setProfile(Profiles.getByName(profile));
		zf2p.generateXML(invoice);
		byte[] xmlWithAttachments = zf2p.getXML();

		// Return result
		String base64XmlWithAttachments = new String(Base64.getEncoder().encode(xmlWithAttachments),
				StandardCharsets.UTF_8);

		System.out.println(base64XmlWithAttachments);
	}
}