[docbook] title with addintional anchor not in the FO output

[markus.sticker.epos]

Hi,

I tried to set a link target for a named destination (PDF --> XSL:FO)
But it always will be ignored in my document.fo

Docbook:

  <chapter>
    <title>
      <phrase>Diagnosis    (Fct-3456) <anchor xml:id="Fct-3456"/></phrase>
    </title>
    <para> <informalfigure><mediaobject><imageobject>......

FO:

<fo:flow flow-name="xsl-region-body" start-indent="0pt" end-indent="0pt">
      <fo:block id="id1134264">
        <fo:block font-family="ZF Sans Bold,Symbol,ZapfDingbats">
          <fo:block margin-left="0pt">
            <fo:block font-size="24.8832pt" font-weight="bold">
              <fo:block hyphenate="true" role="headline0" font-size="16pt" 
keep-with-next.within-column="always" space-before.optimum="8pt" 
space-before.minimum="8pt * 0.8" space-before.maximum="8pt * 1.2" 
text-align="start" start-indent="0pt" hyphenation-character="-" 
hyphenation-push-character-count="1" hyphenation-remain-character-count="2">3.
                <fo:inline>Diagnosis    (Fct-3456) </fo:inline>
              </fo:block>
            </fo:block>

What I'm doing wrong?
Kind regards
Markus Sticker