[Zope] Trying to get tree working

[Frans C.H. Schneider]

Hi *

Maybe this is a stupid question but I just can not get it working.
I have a page from which the user can view basic item data and which has a
link to a page to display the bill of material of the item.

      <TD bgcolor="#97bae6" width="20%">
          <dtml-with "_(abs_path=bmpsiq.absolute_url())">
          <a href="&dtml-abs_path;?ps_par=<dtml-var pt_part>"
             target="main">
             Stuklijst
          </a>
          </dtml-with>
      </TD>

To get the bill of material I have the following sql method:

<params>ps_par</params>
select ps_comp, ps_start, ps_end from ps_mstr
<dtml-sqlgroup where>
  <dtml-sqltest ps_par type=string op=eq>
  <dtml-and>
  <dtml-sqlgroup>
    ps_start = ?
  <dtml-or>
    ps_start <= today
  </dtml-sqlgroup>
</dtml-sqlgroup>

The dtml method to display the tree is :


<dtml-let ps_comp=ps_par>
<dtml-tree id=ps_comp branches_expr="ps_childLookup(ps_par=ps_comp)">
 <b><dtml-var ps_comp></b> <dtml-var ps_start>
</dtml-tree>
</dtml-let>


It works for the first time but when I try to expand it I get a key error on
ps_par.

What goes wrong??


Hope somebody can help

Frans


--
Frans C. H. Schneider		<mailto:f.schneider@nido.nl>
NIDO Universal Machines BV	<http://www.nido.nl>
Industriestraat 34		<mailto:info@nido.nl>
PO Box 30				tel. +31 (0) 548 370 000
7450 AA Holten			fax  +31 (0) 548 370 233
the Netherlands