I'm working in Jaspersoft Studio 6.9.0 and I'm trying to set up a PDF/A-1a document. In the document are images.
I get the error:
com.lowagie.text.pdf.PdfXConformanceException: The /SMask key is not allowed in images.
Be aware that you DON'T use any transparent images in your jrxmls! These are forbidden in PDF/A conformance! Also the colorspace is important. Not sure whether CMYK images were allowed but we had some troubles with certain customer logos some years ago.
But I guess (!) it is because of the transparency
hth + regards