EN16931 / XRechnung / Peppol BIS 3 Validator

PDF/UA-1 rule reference › clause 7.2

PDF/UA-1 rule 7.2-29: Value … of the Lang entry is not a Language-Tag

Fixed by the automatic fix lang

What veraPDF reports

Value %1 of the Lang entry is not a Language-Tag

veraPDF rule 7.2-29 = ISO 14289-1:2014 clause 7.2, test 29, checked on PDF object CosLang.

In Adobe Acrobat’s Accessibility Checker the closest item is “Primary language”.

What the requirement says

If the Lang entry is present in the document's Catalog dictionary or in a structure element dictionary or property list, its value shall be a language identifier as described in ISO 32000-1:2008, 14.9.2. A language identifier shall be a Language-Tag as defined in RFC 3066, Tags for the Identification of Languages

Can it be fixed automatically?

Fixed by the automatic fix. Our automatic fix removed this failure in every test file where veraPDF reported it (measured 2026-10-24 with veraPDF 1.28.2). Run the free check to see the before/after result for your own file before paying.

How to fix it by hand

The /Lang value must be a valid language tag such as en-US, de-DE or fr-FR — correct it in the document properties.

Check your PDF now (free)

Upload the PDF: veraPDF lists every failed PDF/UA-1 rule, our fix runs, and veraPDF checks the fixed file again — you see “N failed rules before → M after” before deciding. The fixed file costs 19 € (excl. VAT); the check is free. We never call a file “accessible” or “compliant”.

Other rules in clause 7.2

Rule text (description and error message): veraPDF validation profile PDF/UA-1 © veraPDF Consortium, licensed under CC BY 4.0. This site is not affiliated with the veraPDF Consortium, the PDF Association, ISO or Adobe. Adobe and Acrobat are trademarks of Adobe; the Acrobat checker item is named only to help you match the two reports.