PROBLEM: Converting to PDF/A-1b: 2005 (CMYK)

Hello,
 

 
I try to have a "PDF/A-1b: 2005 (CMYK)"-version of a document.
 
What I am doing: I print my documnet (sometimes a word-document sometimes a standard.pdf) into a "PDF/A-1b: 2005 (CMYK)"-version.
 
Then I check the document with the preflight-profile if my new document was conform to "PDF/A-1b".
 
Here the surprizing part:
 
The new document is NOT conform!!!!!
  
How could that ever be? I print it into that PDF-version and then it is not conform to the version I printed it in????!!!!????!!!!!!!!!!!!!!!!!!!!!???
  

 
I would be VERY HAPPY to get help on this.
 

 
THANK YOU