Warning if fop generation - table-layout="auto"

Hi,

If I generate PDF from DocBook via the XSL stylesheets I get lots of warning messages like the following:

[fop] WARNING: The following feature isn't implemented by Apache FOP, yet: table-layout="auto" (on fo:table)

I used to ignore them, as the output looks OK but as I recently did not see a severe error in the float of warnings I think I better should remove them.

Any advice how can I get rid of these warnings? 

Best regards, Lars