ArithmetricException on ZUGFeRDImporter, but not ZUGFeRDValidator

[Matthias-SP]

Hello everyone,

I recently upgraded to org.mustangproject.validator 2.16.3 using maven. I'm not sure if this issue was also part of an earlier version, but I do remember this exception showing up once or twice when I was on an older version aswell (around 2.15 I think)

I encounter the following issue when I import a default PDF from ferd-net.de.

My Download might be a bit older, see XML comment:
Version of the File 2.3.0 - 18.09.2024.

• EXTENDED_Fremdwaehrung.pdf

I basically just call

ZUGFeRDImporter importer = new ZUGFeRDImporter(input.getAsInputStream());
and the following exception appears:

14:34:13,755 ERROR [org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter] (Debug-Thread-1) Failed to parse PDF: org.mustangproject.ZUGFeRD.ZUGFeRDExportException: org.mustangproject.Exceptions.ArithmetricException: Could not reproduce the invoice. Payable total in XML is 521.91, but calculated total is 581.41 with tax basis 908.75 and with positions 900.00 = 900.00
at org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter.setRawXML(ZUGFeRDInvoiceImporter.java:247)
at org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter.setRawXML(ZUGFeRDInvoiceImporter.java:258)
at org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter.extractFiles(ZUGFeRDInvoiceImporter.java:219)
at org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter.extractLowLevel(ZUGFeRDInvoiceImporter.java:154)
at org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter.setInputStream(ZUGFeRDInvoiceImporter.java:99)
at org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter.(ZUGFeRDInvoiceImporter.java:85)
at org.mustangproject.ZUGFeRD.ZUGFeRDImporter.(ZUGFeRDImporter.java:43)

as this is the last step of importing / parsing the XML, and the Exception is wrapped into a runtime exception, my code still works, as I do not use the Invoice class that could not have be created.

however, when I validate this PDF, I get no validation issues:

Code:

 ZUGFeRDValidator validator = new ZUGFeRDValidator();
String validationResultXml = validator.validate(input.getAsInputStream(), config.getFileName());

Result:

<?xml version="1.0" encoding="UTF-8"?>
<validation datetime="2025-03-05 15:16:12" filename="example.pdf">
   <pdf>ValidationResult [flavour=3b, totalAssertions=18397, assertions=[], isCompliant=true]
    <info>
         <signature>unknown</signature>
         <duration unit="ms">197</duration>
      </info>
      <summary status="valid"/>
   </pdf>
   <xml>
      <info>
         <version>2</version>
         <profile>urn:cen.eu:en16931:2017#conformant#urn:factur-x.eu:1p0:extended</profile>
         <validator version="2.16.3"/>
         <rules>
            <fired>142</fired>
            <failed>0</failed>
         </rules>
         <duration unit="ms">361</duration>
      </info>
      <summary status="valid"/>
   </xml>
   <summary status="valid"/>
</validation>

So know I'm curious if there is

• a calculation issue, or a missed field for this calculation
• a validation issue where this calculation is not executed / not checked
• the XML in the PDF is actually faulty, and this exception is wanted - but why not part of the validator?
• or something in between, or actually expected behavior. I don't know

For me, it would seems logical that if I get an exception for just importing the PDF, I should also get an Exception regarding the validation.

I hope the title and description is good enough, I tried to follow common sense and did not find any open or closed issue mentioning this exact problem. Like I said, maybe the input is actually wrong, but I'm not that familiar with all of the code and electronic invoice standards (yet)