closes #148

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 {

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;