Add optional Invoicer and Invoicee for Extended profile.

library/src/main/java/org/mustangproject/Invoice.java

@@ -41,7 +41,7 @@ public class Invoice implements IExportableTransaction {
 
 	protected String documentName = null, documentCode = null, number = null, ownOrganisationFullPlaintextInfo = null, referenceNumber = null, shipToOrganisationID = null, shipToOrganisationName = null, shipToStreet = null, shipToZIP = null, shipToLocation = null, shipToCountry = null, buyerOrderReferencedDocumentID = null, buyerOrderReferencedDocumentIssueDateTime = null, ownForeignOrganisationID = null, ownOrganisationName = null, currency = null, paymentTermDescription = null;
 	protected Date issueDate = null, dueDate = null, deliveryDate = null;
-	protected TradeParty sender = null, recipient = null, deliveryAddress = null, payee = null;
+	protected TradeParty sender = null, recipient = null, deliveryAddress = null, payee = null, invoicer = null, invoicee = null;
 	protected ArrayList<CashDiscount> cashDiscounts = null;
 	@JsonDeserialize(contentAs = Item.class)
 	protected ArrayList<IZUGFeRDExportableItem> ZFItems = null;
@@ -722,6 +722,36 @@ public class Invoice implements IExportableTransaction {
 		return this;
 	}
 
+	@Override
+	public TradeParty getInvoicer() {
+		return this.invoicer;
+	}
+
+	/***
+	 * if the invoicer is not the seller, it can be specified here
+	 * @param invoicer the invoice issuing organisation
+	 * @return fluent setter
+	 */
+	public Invoice setInvoicer(TradeParty invoicer) {
+		this.invoicer = invoicer;
+		return this;
+	}
+
+	@Override
+	public TradeParty getInvoicee() {
+		return this.invoicee;
+	}
+
+	/***
+	 * if the invoicee is not the buyer, it can be specified here
+	 * @param invoicee the invoice receiving organisation
+	 * @return fluent setter
+	 */
+	public Invoice setInvoicee(TradeParty invoicee) {
+		this.invoicee = invoicee;
+		return this;
+	}
+
 	/***
 	 * Adds a cash discount (skonto)
 	 * @param c the CashDiscount percent/period combination

library/src/main/java/org/mustangproject/ZUGFeRD/IExportableTransaction.java

@@ -38,6 +38,7 @@ import com.fasterxml.jackson.annotation.JsonIgnore;
 import org.mustangproject.FileAttachment;
 import org.mustangproject.IncludedNote;
 import org.mustangproject.ReferencedDocument;
+import org.mustangproject.TradeParty;
 import org.mustangproject.ZUGFeRD.model.DocumentCodeTypeConstants;
 
 /***
@@ -493,12 +494,30 @@ public interface IExportableTransaction {
 	/***
 	 * payee / payment receiver, if different from seller, ram:Payee (only supported for zf2)
 	 *
-	 * @return the IZUGFeRDExportableTradeParty payment receiver, if different from sellver
+	 * @return the IZUGFeRDExportableTradeParty payment receiver, if different from seller
 	 */
 	default IZUGFeRDExportableTradeParty getPayee() {
 		return null;
 	}
 
+	/***
+	 * invoicer / invoice sender, if different from seller, ram:InvoicerTradeParty
+	 *
+	 * @return the IZUGFeRDExportableTradeParty invoice sender, if different from seller
+	 */
+	default IZUGFeRDExportableTradeParty getInvoicer() {
+		return null;
+	}
+
+	/***
+	 * invoicee / invoice receiver, if different from buyer, ram:InvoiceeTradeParty
+	 *
+	 * @return the IZUGFeRDExportableTradeParty invoice receiver, if different from buyer
+	 */
+	default IZUGFeRDExportableTradeParty getInvoicee() {
+		return null;
+	}
+
 	/***
 	 * specifies the document level delivery period, will be included in a
 	 * BillingSpecifiedPeriod element

library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java

@@ -677,6 +677,17 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 			xml += "<ram:PaymentReference>" + XMLTools.encodeXML(trans.getPaymentReference()) + "</ram:PaymentReference>";
 		}
 		xml += "<ram:InvoiceCurrencyCode>" + trans.getCurrency() + "</ram:InvoiceCurrencyCode>";
+
+		if (this.trans.getInvoicer() != null && getProfile() == Profiles.getByName("Extended")) {
+			xml += "<ram:InvoicerTradeParty>" +
+				getTradePartyAsXML(this.trans.getInvoicer(), false, false) +
+				"</ram:InvoicerTradeParty>";
+		}
+		if (this.trans.getInvoicee() != null && getProfile() == Profiles.getByName("Extended")) {
+			xml += "<ram:InvoiceeTradeParty>" +
+				getTradePartyAsXML(this.trans.getInvoicee(), false, false) +
+				"</ram:InvoiceeTradeParty>";
+		}
 		if (this.trans.getPayee() != null) {
 			xml += "<ram:PayeeTradeParty>" +
 				getTradePartyPayeeAsXML(this.trans.getPayee()) +

library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java

@@ -315,7 +315,7 @@ public class ZUGFeRDInvoiceImporter {
 		final DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
 		//REDHAT
 		//https://www.blackhat.com/docs/us-15/materials/us-15-Wang-FileCry-The-New-Age-Of-XXE-java-wp.pdf
-		dbf.setFeature("http://javax.xml.XMLConstants/feature/secure-processing", true);
+		dbf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
 		dbf.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
 		dbf.setAttribute(XMLConstants.ACCESS_EXTERNAL_SCHEMA, "");
 
@@ -436,6 +436,12 @@ public class ZUGFeRDInvoiceImporter {
 		xpr = xpath.compile("//*[local-name()=\"BuyerTradeParty\"]|//*[local-name()=\"AccountingCustomerParty\"]/*");
 		NodeList BuyerNodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
 
+		xpr = xpath.compile("//*[local-name()=\"InvoicerTradeParty\"]");
+		NodeList invoicerNodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
+
+		xpr = xpath.compile("//*[local-name()=\"InvoiceeTradeParty\"]");
+		NodeList invoiceeNodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
+
 		xpr = xpath.compile("//*[local-name()=\"PayeeTradeParty\"]");
 		NodeList payeeNodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
 
@@ -908,6 +914,14 @@ public class ZUGFeRDInvoiceImporter {
 		}
 
 
+		if (invoicerNodes.getLength() > 0) {
+			zpp.setInvoicer(new TradeParty(invoicerNodes));
+		}
+
+		if (invoiceeNodes.getLength() > 0) {
+			zpp.setInvoicee(new TradeParty(invoiceeNodes));
+		}
+
 		if (payeeNodes.getLength() > 0) {
 			zpp.setPayee(new TradeParty(payeeNodes));
 		}

library/src/test/java/org/mustangproject/ZUGFeRD/ZF2PushTest.java

@@ -604,6 +604,8 @@ public class ZF2PushTest extends TestCase {
 					.setContractReferencedDocument(contractID)
 					.setRecipient(new TradeParty("Franz Müller", "teststr.12", "55232", "Entenhausen", "DE").addGlobalID(gln).setEmail("recipient@test.org").addVATID("DE4711")
 						.setContact(new Contact("Franz Müller", "01779999999", "franz@mueller.de", "teststr. 12", "55232", "Entenhausen", "DE").setFax("++49555123456")).setAdditionalAddress("Hinterhaus 3"))
+					.setInvoicer( new TradeParty("Abweichender Rechnungssteller", "Teststr.12", "04711", "Entenhausen", "DE") )
+					.setInvoicee( new TradeParty("Abweichender Rechnungsempfänger", "Teststr.42", "00815", "Entenhausen", "DE") )
 					.addItem(new Item(new Product("Testprodukt", "", "H87", new BigDecimal(16)).addGlobalID(gtin).setSellerAssignedID("4711"), price, new BigDecimal(1.0)).setId("a123").addBuyerOrderReferencedDocumentID("orderId").addBuyerOrderReferencedDocumentLineID("xxx").addReferencedLineID("xxx").addNote("item level 1/1").addAllowance(new Allowance(new BigDecimal(0.02)).setReason("item discount").setTaxPercent(new BigDecimal(16))).setDetailedDeliveryPeriod(sdf.parse("2020-01-13"), sdf.parse("2020-01-15")))
 					.addCharge(new Charge(new BigDecimal(0.5)).setReason("quick delivery charge").setTaxPercent(new BigDecimal(16)))
 					.addAllowance(new Allowance(new BigDecimal(0.2)).setReason("discount").setTaxPercent(new BigDecimal(16)))
@@ -669,6 +671,8 @@ public class ZF2PushTest extends TestCase {
 
 			assertEquals("++49555123456",i.getRecipient().getContact().getFax());
 
+			assertNotNull(i.getInvoicer());
+			assertNotNull(i.getInvoicee());
 		} catch (XPathExpressionException e) {
 			fail("XPathExpressionException should not be raised");
 		} catch (ParseException e) {