Signing a PDF/A with a JPG image, invalidates the compliance

I am trying to sign a PDF/A document.
I can't do it with Adobe Acrobat without invalidating the PDF/A compliance. So I am using our tool to sign the file.
When I use a BMP as the graphical represenation of the signature, the file remains compliant, if we use a JPG image the compatibility fails.
The only difference between the two PDF/A files (compliant and incompliant) is the XObject that is different (one is simple neat bmp object, the other is a JPG, with Fileter /DCTDecode etc.).
I would like to know if there is any way I can make the JPG image to work without invalidating the PDF/A compliance, or is it inevitable, as a JPG object has attributes that contradict basic concepts of PDF/A.
Thanks
Tal

Thanks.
what you say about PDF/A being a final version makes a lot of sense, but not when you are talking about digital signatures of course.
if you first sign and then convert the file to be PDF/A compliant you automatically invalidate the signatures.
long term electronic archiving and digital signatures is a perfect match, and people still ike to see their hand written signature, even on an electronic document, and it is exactly where the problem begins.
the pre flight is very cheap with information.
it gives me a general note on the XObject that it should start with stream and then CR LF, and must end with an endstream preceeded by EOL. as far as I can tell my object complies with these requirements

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