Adding a tax ExemptionReasonCode to Product.

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

@@ -189,6 +189,9 @@ public class Item implements IZUGFeRDExportableItem {
 			icnm.getAsNodeMap("ApplicableTradeTax")
 				.flatMap(cnm -> cnm.getAsString("ExemptionReason"))
 				.ifPresent(product::setTaxExemptionReason);
+			icnm.getAsNodeMap("ApplicableTradeTax")
+				.flatMap(cnm -> cnm.getAsString("ExemptionReasonCode"))
+				.ifPresent(product::setTaxExemptionReasonCode);
 
 			icnm.getAllNodes("SpecifiedTradeAllowanceCharge").map(NodeMap::new).forEach(stac -> {
 				stac.getAsNodeMap("ChargeIndicator").ifPresent(ci -> {

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

@@ -23,6 +23,7 @@ public class Product implements IZUGFeRDExportableProduct {
 	protected String unit, name, sellerAssignedID, buyerAssignedID;
 	protected String description = "";
 	protected String taxExemptionReason = null;
+	protected String taxExemptionReasonCode = null;
 	protected String taxCategoryCode = null;
 	protected BigDecimal VATPercent;
 	protected boolean isReverseCharge = false;
@@ -157,7 +158,22 @@ public class Product implements IZUGFeRDExportableProduct {
 	 * @return fluent setter
 	 */
 	public Product setTaxExemptionReason(String taxExemptionReasonText) {
-		taxExemptionReason = taxExemptionReasonText;
+		this.taxExemptionReason = taxExemptionReasonText;
+		return this;
+	}
+
+	@Override
+	public String getTaxExemptionReasonCode() {
+		return taxExemptionReasonCode;
+	}
+
+	/***
+	 *
+	 * @param taxExemptionReasonCode, https://docs.peppol.eu/poacc/billing/3.0/codelist/vatex/
+	 * @return fluent setter
+	 */
+	public Product setTaxExemptionReasonCode(String taxExemptionReasonCode) {
+		this.taxExemptionReasonCode = taxExemptionReasonCode;
 		return this;
 	}
 

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

@@ -158,6 +158,10 @@ public interface IZUGFeRDExportableProduct {
 		return null;
 	}
 
+	default String getTaxExemptionReasonCode() {
+		return null;
+	}
+
 	default String getCountryOfOrigin() {
 	    return null;
 	}

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

@@ -537,6 +537,9 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 				if (currentItem.getProduct().getTaxExemptionReason() != null) {
 					xml += "<ram:ExemptionReason>" + XMLTools.encodeXML(currentItem.getProduct().getTaxExemptionReason()) + "</ram:ExemptionReason>";
 				}
+				if (currentItem.getProduct().getTaxExemptionReasonCode() != null) {
+					xml += "<ram:ExemptionReasonCode>" + XMLTools.encodeXML(currentItem.getProduct().getTaxExemptionReasonCode()) + "</ram:ExemptionReasonCode>";
+				}
 				xml += "<ram:CategoryCode>" + currentItem.getProduct().getTaxCategoryCode() + "</ram:CategoryCode>";
 				if (!currentItem.getProduct().getTaxCategoryCode().equals(TaxCategoryCodeTypeConstants.UNTAXEDSERVICE)) {
 					xml += "<ram:RateApplicablePercent>" + vatFormat(currentItem.getProduct().getVATPercent()) + "</ram:RateApplicablePercent>";

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

@@ -160,7 +160,7 @@ public class ZF2PushTest extends TestCase {
 				.setRecipient(new TradeParty("Franz Müller", "teststr.12", "55232", "Entenhausen", "DE").addVATID("DE4711")
 					.setContact(new Contact("Franz Müller", "01779999999", "franz@mueller.de", "teststr. 12", "55232", "Entenhausen", "DE")))
 				.setNumber(number)
-				.addItem(new Item(new Product("Testprodukt", "", "H87", new BigDecimal(0)).setTaxExemptionReason("Kleinunternehmer gemäß §19 UStG").setTaxCategoryCode("E"), price, new BigDecimal(1.0)).addNote(theNote))
+				.addItem(new Item(new Product("Testprodukt", "", "H87", new BigDecimal(0)).setTaxExemptionReason("Kleinunternehmer gemäß §19 UStG").setTaxCategoryCode("E").setTaxExemptionReasonCode( "VATEX-EU-I" ), price, new BigDecimal(1.0)).addNote(theNote))
 			);
 			String theXML = new String(ze.getProvider().getXML(), StandardCharsets.UTF_8);
 			assertTrue(theXML.contains("<rsm:CrossIndustryInvoice"));
@@ -179,6 +179,7 @@ public class ZF2PushTest extends TestCase {
 		}
 
 		assertEquals(i.getZFItems()[0].getNotesWithSubjectCode().get(0).getContent(), theNote);
+		assertNotNull(i.getZFItems()[0].getProduct().getTaxExemptionReasonCode());
 		assertEquals(senderDescription, i.getSender().getDescription());
 
 		// now check the contents (like MustangReaderTest)