What this is about
The visible PDF part shows a different invoice or VAT amount than the invoice data. In ZUGFeRD the embedded XML is the authoritative part — if the visible part states a different VAT amount, the tax can be owed twice under German law (§ 14c UStG), forcing corrections and cancellations to set the books straight.
What to do
Correct the lines and amounts until net, VAT and gross exactly match the totals printed in the PDF — or regenerate the PDF. Use the file only once both parts say the same.
Does the error keep coming back?
Then it is not chance but a pipe connected the wrong way. The free 15-minute check finds the spot.
Arrange a check