diff --git a/History.md b/History.md
index 36fa2040..dc7128ab 100644
--- a/History.md
+++ b/History.md
@@ -3,7 +3,7 @@
 2024-
 - 435 use invoiceimporter as common technical basis also for zugferdimporter 
 - also import delivery address
-- 527 metrics raises errors
+- 527 metrics may raise error on some pdf files
 - 517 read product GlobalID
 - 380 Added test for input stream validation
 - 518 corrently validate more XRechnung versions
@@ -13,6 +13,8 @@
 - 532 support validation warnings!
 - 534 new signature
 - 538 Mustang validator always claims PDF is invalid if flavour is PDF/A-3A
+- 555 be able to validate ubl credit notes
+- when parsing now distinguishing between the parseExceptions StructureException and ArithmetricException
 
 
 2.14.2
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java
index e9c5f712..cebeb824 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java
@@ -54,15 +54,6 @@ public class ZUGFeRDImporter extends ZUGFeRDInvoiceImporter {
 	}
 
 
-	/***
-	 * Wrapper for protected method extractString
-	 * @param xpathStr the xpath expression to be evaluated
-	 * @return the extracted String for the specific path in the document
-	 */
-	public String wExtractString(String xpathStr) {
-		return extractString(xpathStr);
-	}
-
 
 	////////////////////////////////////
 
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java
index 5c9ee429..600b2879 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java
@@ -9,6 +9,8 @@ import org.apache.pdfbox.pdmodel.common.PDNameTreeNode;
 import org.apache.pdfbox.pdmodel.common.filespecification.PDComplexFileSpecification;
 import org.apache.pdfbox.pdmodel.common.filespecification.PDEmbeddedFile;
 import org.mustangproject.*;
+import org.mustangproject.Exceptions.ArithmetricException;
+import org.mustangproject.Exceptions.StructureException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.w3c.dom.Document;
@@ -701,15 +703,13 @@ public class ZUGFeRDInvoiceImporter {
 			try {
 				whichType = getStandard();
 			} catch (Exception e) {
-				throw new ParseException("Could not find out if it's an invoice, order, or delivery advice", 0);
-
+				throw new StructureException("Could not find out if it's an invoice, order, or delivery advice", 0);
 			}
 
 			if ((whichType != EStandard.despatchadvice)
 				&& ((!expectedStringTotalGross.equals(XMLTools.nDigitFormat(expectedGrandTotal, 2)))
 				&& (!ignoreCalculationErrors))) {
-				throw new ParseException(
-					"Could not reproduce the invoice, this could mean that it could not be read properly", 0);
+				throw new ArithmetricException();
 			}
 		}
 		return zpp;