Add methods to add SpecifiedProcuringProject

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

@@ -50,6 +50,11 @@ public class Invoice implements IExportableTransaction {
 			Charges = new ArrayList<>(), LogisticsServiceCharges = new ArrayList<>();
 	protected IZUGFeRDPaymentTerms paymentTerms = null;
 	private Date invoiceReferencedIssueDate;
+	private String specifiedProcuringProjectID = null;
+
+  
+
+	private String specifiedProcuringProjectName = null;
 
   public Invoice() {
 		ZFItems = new ArrayList<>();
@@ -647,4 +652,23 @@ public class Invoice implements IExportableTransaction {
 		return this;
 	}
 
+	@Override
+	public String getSpecifiedProcuringProjectID() {
+		return specifiedProcuringProjectID;
+	}
+
+	public Invoice setSpecifiedProcuringProjectID(String specifiedProcuringProjectID) {
+		this.specifiedProcuringProjectID = specifiedProcuringProjectID;
+		return this;
+	}
+
+	@Override
+	public String getSpecifiedProcuringProjectName() {
+		return specifiedProcuringProjectName;
+	}
+
+	public Invoice setSpecifiedProcuringProjectName(String specifiedProcuringProjectName) {
+		this.specifiedProcuringProjectName = specifiedProcuringProjectName;
+		return this;
+	}
 }

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

@@ -489,4 +489,12 @@ public interface IExportableTransaction  {
 	default String[] getNotes() {
 		return null;
 	}
+
+	default String getSpecifiedProcuringProjectName(){
+		return null;
+	}
+
+	default String getSpecifiedProcuringProjectID(){
+		return null;
+	}
 }

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

@@ -457,6 +457,15 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 			}
 		}
 
+		if (trans.getSpecifiedProcuringProjectID() != null) {
+			xml = xml + "   <ram:SpecifiedProcuringProject>\n"
+			+ "       <ram:ID>"
+			+ XMLTools.encodeXML(trans.getSpecifiedProcuringProjectID()) + "</ram:ID>\n";
+			if(trans.getSpecifiedProcuringProjectName()!= null) {
+				xml += "       <ram:Name >" + XMLTools.encodeXML(trans.getSpecifiedProcuringProjectName()) + "</ram:Name>\n";
+			}
+			xml += "    </ram:ContractReferencedDocument>\n";
+		}
 		xml = xml + "		</ram:ApplicableHeaderTradeAgreement>\n"
 				+ "		<ram:ApplicableHeaderTradeDelivery>\n";
 		if (this.trans.getDeliveryAddress() != null) {