For each PDF/A-1 validation issue we try to explain what it means and, if possible how to resolve it. For a more technical explanation of the issue we quote the related section of the ISO 19005-1 PDF/A Specification.
A Widget annotation dictionary or Field dictionary shall not include an AA entry for an additional-actions dictionary. The document catalog dictionary shall not include an AA entry for an additional-actions dictionary.
NOTE: These additional-actions dictionaries define arbitrary JavaScript actions. The explicit prohibition of the AA entry has the implicit effect of disallowing JavaScript actions that can create external dependencies and complicate preservation efforts.