These are the validation results returned by Qoppa’s jPDFPreflight library.

pferror16 Items that are not PDF/A compliant and that can not be fixed by PDF/A conversion.

pfcouldfix16 Items that are not PDF/A compliant and that could be fixed by PDF/A conversion. Users have chosen to be warned about this item in PDF/A settings.

pfwarn16 Items that are not PDF/A compliant and that can and will be fixed by PDF/A Conversion.