closiong #247

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

@@ -14,6 +14,7 @@ public class Item implements IZUGFeRDExportableItem {
 	protected BigDecimal price, quantity, tax, grossPrice, lineTotalAmount;
 	protected Date detailedDeliveryPeriodFrom=null, detailedDeliveryPeriodTo=null;
 	protected String id;
+	protected String referencedLineID=null;
 	protected Product product;
 	protected ArrayList<String> notes = null;
 	protected ArrayList<IZUGFeRDAllowanceCharge> Allowances = new ArrayList<IZUGFeRDAllowanceCharge>(),
@@ -31,6 +32,21 @@ public class Item implements IZUGFeRDExportableItem {
 		this.product = product;
 	}
 
+
+	public Item addReferencedLineID(String s) {
+		referencedLineID=s;
+		return this;
+	}
+
+	/***
+	 * BT 132 (issue https://github.com/ZUGFeRD/mustangproject/issues/247)
+	 * @return
+	 */
+	@Override
+	public String getBuyerOrderReferencedDocumentLineID() {
+		return referencedLineID;
+	}
+
 	public BigDecimal getLineTotalAmount() {
 		return lineTotalAmount;
 	}

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

@@ -50,6 +50,15 @@ public interface IZUGFeRDExportableItem extends IAbsoluteValueProvider{
 	}
 
 
+	/***
+	 * BT 132 (issue https://github.com/ZUGFeRD/mustangproject/issues/247)
+	 * @return
+	 */
+	default String getBuyerOrderReferencedDocumentLineID() {
+		return null;
+	}
+
+
 	/**
 	 * The price of one item excl. taxes
 	 *

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

@@ -350,8 +350,14 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 					+ "</ram:Description>\n"
 					+ "			</ram:SpecifiedTradeProduct>\n"
 
-					+ "			<ram:SpecifiedLineTradeAgreement>\n"
+					+ "			<ram:SpecifiedLineTradeAgreement>\n";
-					+ "				<ram:GrossPriceProductTradePrice>\n"
+			if (currentItem.getBuyerOrderReferencedDocumentLineID() != null) {
+				xml = xml + "				<ram:BuyerOrderReferencedDocument> \n"
+						+ "					<ram:LineID>"+XMLTools.encodeXML(currentItem.getBuyerOrderReferencedDocumentLineID())+"</ram:LineID>\n"
+						+ "				</ram:BuyerOrderReferencedDocument>\n";
+
+			}
+			xml = xml + "				<ram:GrossPriceProductTradePrice>\n"
 					+ "					<ram:ChargeAmount>" + priceFormat(lc.getPriceGross())
 					+ "</ram:ChargeAmount>\n" //currencyID=\"EUR\"
 					+ "<ram:BasisQuantity unitCode=\"" + XMLTools.encodeXML(currentItem.getProduct().getUnit())

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

@@ -377,7 +377,7 @@ public class ZF2PushTest extends TestCase {
 						.setDeliveryAddress(new TradeParty("just the other side of the street", "teststr.12a", "55232", "Entenhausen", "DE").addVATID("DE47110"))
 						.setContractReferencedDocument(contractID)
 						.setRecipient(new TradeParty("Franz Müller", "teststr.12", "55232", "Entenhausen", "DE").setID("0008734").addVATID("DE4711").setContact(new Contact("Franz Müller", "01779999999", "franz@mueller.de", "teststr. 12", "55232", "Entenhausen", "DE").setFax("++49555123456")).setAdditionalAddress("Hinterhaus 3"))
-						.addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(16)), price, new BigDecimal(1.0)).addNote("item level 1/1").addAllowance(new Allowance(new BigDecimal(0.02)).setReason("item discount").setTaxPercent(new BigDecimal(16))).setDetailedDeliveryPeriod(sdf.parse("2020-01-13"), sdf.parse("2020-01-15")))
+						.addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(16)), price, new BigDecimal(1.0)).addReferencedLineID("xxx").addNote("item level 1/1").addAllowance(new Allowance(new BigDecimal(0.02)).setReason("item discount").setTaxPercent(new BigDecimal(16))).setDetailedDeliveryPeriod(sdf.parse("2020-01-13"), sdf.parse("2020-01-15")))
 						.addCharge(new Charge(new BigDecimal(0.5)).setReason("quick delivery charge").setTaxPercent(new BigDecimal(16)))
 						.addAllowance(new Allowance(new BigDecimal(0.2)).setReason("discount").setTaxPercent(new BigDecimal(16)))
 						.setDeliveryDate(sdf.parse("2020-11-02")).setOwnVATID("DE0815").setNumber(number)
@@ -399,6 +399,7 @@ public class ZF2PushTest extends TestCase {
 		assertTrue(zi.getUTF8().contains("Hinterhaus"));
 		assertTrue(zi.getUTF8().contains("0009845"));
 		assertTrue(zi.getUTF8().contains("0008734"));
+		assertTrue(zi.getUTF8().contains("ram:BuyerOrderReferencedDocument"));
 		assertTrue(zi.getUTF8().contains(occurrenceFrom));
 		assertTrue(zi.getUTF8().contains(occurrenceTo));
 		assertTrue(zi.getUTF8().contains(contractID));

validator/src/test/java/org/mustangproject/validator/LibraryTest.java

@@ -99,6 +99,24 @@ public class LibraryTest extends ResourceCase {
 
 	}
 
+	public void testLibraryPushEdge() {
+		File tempFile = new File("../library/target/testout-ZF2PushEdge.pdf");
+		assertTrue(tempFile.exists());
+		ZUGFeRDValidator zfv = new ZUGFeRDValidator();
+
+		String res = zfv.validate(tempFile.getAbsolutePath());
+
+
+		assertThat(res).valueByXPath("/validation/pdf/summary/@status")
+				.isEqualTo("valid");
+
+		assertThat(res).valueByXPath("/validation/xml/summary/@status")
+				.isEqualTo("valid");
+
+		assertThat(res).valueByXPath("/validation/summary/@status")
+				.isEqualTo("valid");
+
+	}
 	public void testLibraryPushAllowances() {
 		File tempFile = new File("../library/target/testout-ZF2PushChargesAllowances.pdf");
 		assertTrue(tempFile.exists());