DOCBOOK-APPS: Image scale problem

[Martin Perina <docbk-app at ataco dot cz>]

Hello,

I've just installed new stylesheets 1.48 and new PassiveTeX 
and I've new problem with images when using scale parameter
in imagedata tag:

  <imageobject>
    <imagedata fileref="obrazky/historie_ll.jpg" 
               format="JPG" 
               align="center"
               scale="50"/>
  </imageobject>

When I process this code through PassiveTeX, it shows
this error:

<obrazky/historie_ll.jpg, id=165, 1027.84pt x 770.88pt>
! Illegal unit of measure (pt inserted).
<to be read again> 
                   %
l.9 ... content-width="50%" content-height="50%"/>
                                                 
</fo:block></fo:block><fo:...


Is that a stylesheets or PassiveTeX problem?

Thanks for any help.

Martin Perina