diff --git a/History.md b/History.md
index fe57a7ee..92550031 100644
--- a/History.md
+++ b/History.md
@@ -1,5 +1,12 @@
+1.7.7
+=====
+
+- Refactored comparison operator for ChargeIndicator https://github.com/ZUGFeRD/mustangproject/pull/153
+- #148 support additional documents for items
+
 1.7.6
 =====
+2020-02-06
 
 - support different ship to address
 - allow for diffent namespace prefixes #140
diff --git a/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableItem.java b/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableItem.java
index 85b0577d..a4dfcc80 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableItem.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableItem.java
@@ -56,5 +56,9 @@ public interface IZUGFeRDExportableItem {
 	default String getCategoryCode() {
 		return TaxCategoryCodeTypeConstants.STANDARDRATE;
 	}
+	
+	default String getAdditionalReferencedDocumentID() {
+		return null;
+	}
 
 }
diff --git a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
index 8724edf8..af357eb0 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
@@ -357,16 +357,21 @@ public class ZUGFeRD2PullProvider implements IXMLProvider, IProfileProvider {
 					+ "			<ram:SpecifiedLineTradeSettlement>\n" //$NON-NLS-1$
 					+ "				<ram:ApplicableTradeTax>\n" //$NON-NLS-1$
 					+ "					<ram:TypeCode>VAT</ram:TypeCode>\n" //$NON-NLS-1$
-					+ "					<ram:CategoryCode>"+currentItem.getProduct().getTaxCategoryCode()+"</ram:CategoryCode>\n" //$NON-NLS-1$
 					+ exemptionReason
+					+ "					<ram:CategoryCode>"+currentItem.getProduct().getTaxCategoryCode()+"</ram:CategoryCode>\n" //$NON-NLS-1$
+					
 					+ "					<ram:RateApplicablePercent>" //$NON-NLS-1$
 					+ vatFormat(currentItem.getProduct().getVATPercent()) + "</ram:RateApplicablePercent>\n" //$NON-NLS-1$
 					+ "				</ram:ApplicableTradeTax>\n" //$NON-NLS-1$
 					+ "				<ram:SpecifiedTradeSettlementLineMonetarySummation>\n" //$NON-NLS-1$
 					+ "					<ram:LineTotalAmount>" + currencyFormat(lc.getItemTotalNetAmount()) //$NON-NLS-1$
 					+ "</ram:LineTotalAmount>\n" //$NON-NLS-1$ // currencyID=\"EUR\"
-					+ "				</ram:SpecifiedTradeSettlementLineMonetarySummation>\n" //$NON-NLS-1$
-					+ "			</ram:SpecifiedLineTradeSettlement>\n" //$NON-NLS-1$
+					+ "				</ram:SpecifiedTradeSettlementLineMonetarySummation>\n"; //$NON-NLS-1$
+					if (currentItem.getAdditionalReferencedDocumentID()!=null) {
+						xml=xml	+ "			<ram:AdditionalReferencedDocument><ram:IssuerAssignedID>"+currentItem.getAdditionalReferencedDocumentID()+"</ram:IssuerAssignedID><ram:TypeCode>130</ram:TypeCode></ram:AdditionalReferencedDocument>\n"; //$NON-NLS-1$
+											
+					}
+				xml=xml	+ "			</ram:SpecifiedLineTradeSettlement>\n" //$NON-NLS-1$
 					+ "		</ram:IncludedSupplyChainTradeLineItem>\n"; //$NON-NLS-1$
 
 		}
@@ -490,9 +495,9 @@ public class ZUGFeRD2PullProvider implements IXMLProvider, IProfileProvider {
 						+ "				<ram:CalculatedAmount>" + currencyFormat(amount.getCalculated()) //$NON-NLS-1$
 						+ "</ram:CalculatedAmount>\n" //$NON-NLS-1$ //currencyID=\"EUR\"
 						+ "				<ram:TypeCode>VAT</ram:TypeCode>\n" //$NON-NLS-1$
+						+ exemptionReason
 						+ "				<ram:BasisAmount>" + currencyFormat(amount.getBasis()) + "</ram:BasisAmount>\n" // currencyID=\"EUR\"
 						+ "				<ram:CategoryCode>"+taxCategoryCode+"</ram:CategoryCode>\n" //$NON-NLS-1$
-						+ exemptionReason
 						+ "				<ram:RateApplicablePercent>" + vatFormat(currentTaxPercent) //$NON-NLS-1$
 						+ "</ram:RateApplicablePercent>\n" + "			</ram:ApplicableTradeTax>\n"; //$NON-NLS-2$
 
diff --git a/src/test/java/org/mustangproject/ZUGFeRD/MustangReaderTestCase.java b/src/test/java/org/mustangproject/ZUGFeRD/MustangReaderTestCase.java
index 099a70f5..4252e2cb 100644
--- a/src/test/java/org/mustangproject/ZUGFeRD/MustangReaderTestCase.java
+++ b/src/test/java/org/mustangproject/ZUGFeRD/MustangReaderTestCase.java
@@ -22,6 +22,8 @@ import junit.framework.TestCase;
 
 import java.math.BigDecimal;
 
+import org.mustangproject.ZUGFeRD.MustangReaderTestCase.Item;
+
 public abstract class MustangReaderTestCase extends TestCase implements IZUGFeRDExportableTransaction {
 
 	public MustangReaderTestCase(String testName) {
@@ -134,6 +136,11 @@ public abstract class MustangReaderTestCase extends TestCase implements IZUGFeRD
 
 		private BigDecimal price, quantity;
 		private IZUGFeRDExportableProduct product;
+		private String addReference=null;
+		
+		public String getAdditionalReferencedDocumentID() {
+			return addReference;
+		}
 
 		@Override
 		public BigDecimal getPrice() {
@@ -172,6 +179,15 @@ public abstract class MustangReaderTestCase extends TestCase implements IZUGFeRD
 			return null;
 		}
 
+		public String getAddReference() {
+			return addReference;
+		}
+
+		public void setAddReference(String addReference) {
+			this.addReference = addReference;
+		}
+		
+
 	}
 
 	protected class Product implements IZUGFeRDExportableProduct {
diff --git a/src/test/java/org/mustangproject/ZUGFeRD/ZF2EdgeTest.java b/src/test/java/org/mustangproject/ZUGFeRD/ZF2EdgeTest.java
index 1ec05af1..ef52b2a2 100644
--- a/src/test/java/org/mustangproject/ZUGFeRD/ZF2EdgeTest.java
+++ b/src/test/java/org/mustangproject/ZUGFeRD/ZF2EdgeTest.java
@@ -30,6 +30,7 @@ import java.util.GregorianCalendar;
 
 import org.junit.FixMethodOrder;
 import org.junit.runners.MethodSorters;
+import org.mustangproject.ZUGFeRD.MustangReaderTestCase.Item;
 
 import junit.framework.Test;
 import junit.framework.TestSuite;
@@ -202,7 +203,9 @@ public class ZF2EdgeTest extends MustangReaderTestCase implements IZUGFeRDExport
 																									// 103
 		EdgeProduct airProduct = new EdgeProduct("", "Heiße Luft pro Liter", "LTR");
 
-		allItems[0] = new Item(new BigDecimal("160"), new BigDecimal("1"), designProduct);
+		Item design=new Item(new BigDecimal("160"), new BigDecimal("1"), designProduct);
+		design.setAddReference("1825");
+		allItems[0] = design;
 		allItems[1] = new Item(new BigDecimal("0.79"), new BigDecimal("400"), balloonProduct);
 		allItems[2] = new Item(new BigDecimal("0.10"), new BigDecimal("200"), airProduct);
 		return allItems;