[Zope] <dtml-bar total-...> is always empty in <dtml-in>

[Patrick Ulmer]

Hi,

I have a little problem query my databasetable and get the total value 
of a numeric field "garantiewert". <dtml-var total-garantiewert> is 
alwas empty. For example <dtml-var count-garantiewert> works. I'm using 
zope 2.6.1.

<dtml-in SelectGarantiewerte>
  <dtml-var garantiewert><br>
  <dtml-if sequence-end>
    <dtml-var total-garantiewert><br>
  </dtml-if>
</dtml-in>

Can somebody help me?

Thanks,
Patrick