closes #1011

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

@@ -5,6 +5,7 @@ package org.mustangproject;
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import org.mustangproject.ZUGFeRD.TransactionCalculator;
+import org.mustangproject.ZUGFeRD.VATAmount;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -19,6 +20,7 @@ public class CalculatedInvoice extends Invoice implements Serializable {
 	protected BigDecimal duePayable=null;
 	protected BigDecimal grandTotal=null;
 	protected BigDecimal taxBasis=null;
+	protected BigDecimal VATtotal=null;
 	protected TransactionCalculator tc=null;
 
     public void calculate() {
@@ -27,6 +29,10 @@ public class CalculatedInvoice extends Invoice implements Serializable {
 		lineTotalAmount=tc.getValue();
 		duePayable=tc.getDuePayable();
 		taxBasis= tc.getTaxBasis();
+		VATtotal=BigDecimal.ZERO;
+		for (VATAmount vam:getCalculation().getTaxDetails()) {
+			VATtotal=VATtotal.add(vam.getCalculated());
+		}
     }
 	public BigDecimal getGrandTotal() {
 		if (grandTotal==null) {
@@ -88,6 +94,28 @@ public class CalculatedInvoice extends Invoice implements Serializable {
 		return lineTotalAmount;
 	}
 
+	/***
+	 * usually one would use calculate, use only if the invoice is parsed
+	 * BT-110
+	 * @param parsedValue the gross total minus net
+	 * @return fluent setter
+	 */
+	public CalculatedInvoice setVATtotal(BigDecimal parsedValue) {
+		VATtotal=parsedValue;
+		return this;
+	}
+
+	/***
+	 *
+	 * @return expect a value close to getGrandTotal-LineTotalAmount
+	 */
+	public BigDecimal getVATtotal() {
+		if (VATtotal==null) {
+			calculate();
+		}
+		return VATtotal;
+	}
+
 	/***
 	 * usually one would use calculate, use only if the invoice is parsed
 	 * @param total the net total

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

@@ -514,6 +514,14 @@ public class ZUGFeRDInvoiceImporter {
 			}
 		}
 
+		xpr = xpath.compile("//*[local-name()=\"SpecifiedTradeSettlementHeaderMonetarySummation\"]/*[local-name()=\"TaxTotalAmount\"]|//*[local-name()=\"TaxTotal\"]/*[local-name()=\"TaxAmount\"]");
+		NodeList taxTotalNodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
+		if (taxTotalNodes.getLength() > 0) {
+			if (zpp instanceof CalculatedInvoice) {
+				((CalculatedInvoice) zpp).setVATtotal(new BigDecimal(XMLTools.trimOrNull(taxTotalNodes.item(0))));
+			}
+		}
+
 		xpr = xpath.compile("//*[local-name()=\"SpecifiedTradeSettlementHeaderMonetarySummation\"]/*[local-name()=\"DuePayableAmount\"]|//*[local-name()=\"LegalMonetaryTotal\"]/*[local-name()=\"PayableAmount\"]");
 		NodeList lineDueNodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
 		BigDecimal duePayableAmount = null;

library/src/test/java/org/mustangproject/ZUGFeRD/ZF2ZInvoiceImporterTest.java

@@ -718,6 +718,7 @@ public class ZF2ZInvoiceImporterTest extends ResourceCase {
 			zii.extractInto(i);
 			assertEquals("123", i.getNumber());
 			assertEquals("1.48", i.getGrandTotal().toString());
+			assertEquals("0.20", i.getVATtotal().toString());
 			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
 
 			assertEquals("2020-10-01", sdf.format(i.getDetailedDeliveryPeriodFrom()));
@@ -751,13 +752,16 @@ public class ZF2ZInvoiceImporterTest extends ResourceCase {
 		BigDecimal expectedPrepaid=new BigDecimal(50);
 		BigDecimal expectedLineTotal=new BigDecimal("180.76");
 		BigDecimal expectedDue=new BigDecimal("147.65");
+		BigDecimal expectedTax=new BigDecimal("20.16");
 		if (isBD) {
 			BigDecimal amread=invoice.getTotalPrepaidAmount();
 			BigDecimal importedLineTotal=invoice.getLineTotalAmount();
 			BigDecimal importedDuePayable=invoice.getDuePayable();
+			BigDecimal importedTaxAmount=invoice.getVATtotal();
 			assertTrue(amread.compareTo(expectedPrepaid) == 0);
 			assertTrue(importedLineTotal.compareTo(expectedLineTotal) == 0);
 			assertTrue(importedDuePayable.compareTo(expectedDue) == 0);
+			assertTrue(importedTaxAmount.compareTo(expectedTax) == 0);
 		}
 
 	}