reverting redundant BT-128 changes

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

@@ -35,7 +35,6 @@ public class Item implements IZUGFeRDExportableItem {
 	protected String id;
 	protected String buyerOrderReferencedDocumentLineID = null;
 	protected String buyerOrderReferencedDocumentID = null;
-	protected ReferencedDocument tenderReferencedDocument=null;
 	protected Product product;
 	protected ArrayList<String> notes = null;
 	protected ArrayList<ReferencedDocument> referencedDocuments = null;
@@ -132,28 +131,7 @@ public class Item implements IZUGFeRDExportableItem {
 				product = new Product();
 			}
 		}
-		itemMap.getAsNodeMap("DocumentReference").ifPresent(drnm -> {
-			// BT-128
-			ReferencedDocument rd=getTenderReferencedDocument();
-			if (rd==null) {
-				rd=new ReferencedDocument();
-			}
-			Node idNode=drnm.getNode("ID").get();
-			if (idNode!=null) {
-				rd.setIssuerAssignedID(idNode.getTextContent());
-				Node schemeIDAttr;
 
-				schemeIDAttr=idNode.getAttributes().getNamedItem("schemeID");
-				if (schemeIDAttr!=null) {
-					rd.setReferenceTypeCode(schemeIDAttr.getNodeValue());
-				}
-			}
-
-			drnm.getAsString("DocumentTypeCode").ifPresent(rd::setTypeCode);
-			if (rd!=null) {
-				setTenderReferencedDocument(rd);
-			}
-		});
 
 		itemMap.getAsNodeMap("SpecifiedLineTradeAgreement", "SpecifiedSupplyChainTradeAgreement").ifPresent(icnm -> {
 			icnm.getAsNodeMap("BuyerOrderReferencedDocument")
@@ -645,21 +623,6 @@ public class Item implements IZUGFeRDExportableItem {
 		return detailedDeliveryPeriodTo;
 	}
 
-	@Override
-	public ReferencedDocument getTenderReferencedDocument() {
-		return tenderReferencedDocument;
-	}
-
-	public Item setTenderReferencedDocument(ReferencedDocument idr) {
-		tenderReferencedDocument=idr;
-		return this;
-	}
-
-	public Item setTenderReferencedDocument(String id) {
-		ReferencedDocument rd=new ReferencedDocument(id);
-		setTenderReferencedDocument(rd);
-		return this;
-	}
 
 	public IZUGFeRDExportableItem addNotes(Collection<IncludedNote> notes) {
 		if (notes == null) {

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

@@ -2,6 +2,7 @@ package org.mustangproject;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
+
 import java.util.Date;
 
 import org.mustangproject.ZUGFeRD.IReferencedDocument;
@@ -40,7 +41,7 @@ public class ReferencedDocument implements IReferencedDocument {
 		this(issuerAssingedID);
 		this.formattedIssueDateTime = formattedIssueDateTime;
 	}
-	
+
 	public ReferencedDocument(String issuerAssignedID) {
 		this.issuerAssignedID = issuerAssignedID;
 	}
@@ -55,6 +56,7 @@ public class ReferencedDocument implements IReferencedDocument {
 
 	/**
 	 * which type is the document? e.g. "916" for additional invoice related
+	 *
 	 * @param typeCode as String, e.g. 916
 	 */
 	public void setTypeCode(String typeCode) {
@@ -63,6 +65,7 @@ public class ReferencedDocument implements IReferencedDocument {
 
 	/**
 	 * type of the reference of this line, a UNTDID 1153 code
+	 *
 	 * @param referenceTypeCode three uppercase character reference type code as string
 	 */
 	public void setReferenceTypeCode(String referenceTypeCode) {
@@ -94,8 +97,7 @@ public class ReferencedDocument implements IReferencedDocument {
 	}
 
 	@Override
-	public Date getFormattedIssueDateTime()
-	{
+	public Date getFormattedIssueDateTime() {
 		return formattedIssueDateTime;
 	}
 
@@ -104,9 +106,20 @@ public class ReferencedDocument implements IReferencedDocument {
 			return null;
 		}
 		NodeMap nodes = new NodeMap(node);
-		return new ReferencedDocument(nodes.getAsStringOrNull("IssuerAssignedID", "ID"),
+		ReferencedDocument rd = new ReferencedDocument(nodes.getAsStringOrNull("IssuerAssignedID", "ID"),
 			nodes.getAsStringOrNull("TypeCode", "DocumentTypeCode"),
 			nodes.getAsStringOrNull("ReferenceTypeCode"),
 			XMLTools.tryDate(nodes.getAsStringOrNull("FormattedIssueDateTime")));
+		if (nodes.getAsStringOrNull("ID") != null) {
+			//sure sign for UBL: here ReferenceTypeCode is no element but a "schemeID" attribute to ID
+			Node idNode = nodes.getNode("ID").get();
+			if (idNode != null) {
+				Node schemeIDAttr = idNode.getAttributes().getNamedItem("schemeID");
+				if (schemeIDAttr != null) {
+					rd.setReferenceTypeCode(schemeIDAttr.getNodeValue());
+				}
+			}
+		}
+		return rd;
 	}
 }

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

@@ -156,14 +156,6 @@ public interface IZUGFeRDExportableItem extends IAbsoluteValueProvider{
 	}
 
 
-	/***
-	 * tender reference on line level BT-128
-	 * @return BT-17 on line level
-	 */
-	default IReferencedDocument getTenderReferencedDocument() {
-		return null;
-	}
-
 
 		/***
 		 * specifies the item level delivery period (there is also one on document level),