set BuyerOrderReferencedDocument and correct TypeCode for correction

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

@@ -21,6 +21,7 @@
 package org.mustangproject;
 
 import org.mustangproject.ZUGFeRD.*;
+import org.mustangproject.ZUGFeRD.model.DocumentCodeTypeConstants;
 
 import java.math.BigDecimal;
 import java.util.ArrayList;
@@ -87,7 +88,8 @@ public class Invoice implements IExportableTransaction {
 	 * @return
 	 */
 	public Invoice setCorrection(String number) {
-
+		setBuyerOrderReferencedDocumentID(number);
+		documentCode= DocumentCodeTypeConstants.CORRECTEDINVOICE;
 		return this;
 	}
 

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

@@ -35,6 +35,7 @@ import org.dom4j.DocumentException;
 import org.dom4j.DocumentHelper;
 import org.dom4j.io.OutputFormat;
 import org.dom4j.io.XMLWriter;
+import org.mustangproject.Invoice;
 import org.mustangproject.XMLTools;
 
 public class ZUGFeRD2PullProvider implements IXMLProvider, IProfileProvider {
@@ -213,8 +214,7 @@ public class ZUGFeRD2PullProvider implements IXMLProvider, IProfileProvider {
 		return xml;
 
 	}
-
-	@Override
+		@Override
 	public void generateXML(IExportableTransaction trans) {
 		this.trans = trans;
 

library/src/main/java/org/mustangproject/ZUGFeRD/model/DocumentCodeTypeConstants.java

@@ -21,5 +21,6 @@ package org.mustangproject.ZUGFeRD.model;
 public class DocumentCodeTypeConstants {
 	public static final String INVOICE = "380";
 	public static final String DEBITNOTE = "84";
+	public static final String CORRECTEDINVOICE = "384";
 	public static final String CREDITNOTE = "389";
 }

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

@@ -250,7 +250,7 @@ public class ZF2PushTest extends TestCase {
 		ZUGFeRDImporter zi = new ZUGFeRDImporter(TARGET_CORRECTIONPDF);
 
 		assertTrue(zi.getUTF8().contains("EUR"));
-
+//totest: typecode 384, BuyerOrderReferencedDocument
 		// Reading ZUGFeRD
 		assertEquals("-3.57", zi.getAmount());
 		assertEquals(zi.getHolder(), orgname);