A font is not embedded in the PDF
Every font must be embedded, including the fourteen standard PDF fonts.
Only the issuer holds this value: Factlint reports it and never fabricates it. Test your invoice to find out whether it is affected.
Common searches around this code
These phrases mirror what an integrator searches for: code, syntax, rule, business field and correction.
Test your file with this error in mind
Upload the invoice involved: the report will say whether this code appears, where it appears in the document, and whether Factlint can only report it or also fix it.
To automate this check in an ERP flow, call the validation API and link every returned code to its public page.
Why this error happens
Helvetica left out is enough to fail PDF/A validation. The recurring trap: a PDF produced by headless Chrome, wkhtmltopdf or a virtual printer is not a PDF/A, whatever its extension says.
How to fix it
The PDF must be regenerated with its fonts embedded. No automatic correction is possible: rewriting a document's glyphs would amount to producing a different document.
XML correction example
/BaseFont /Helvetica <!-- ni /FontFile2 ni /FontFile3 -->
/BaseFont /AAAAAA+Helvetica /FontFile2 42 0 R