Workflow with special Objects

Hello,
  I'm using zms 2.8 with zope 2.8. I have done a ZMSCustom "article" for 
a online shop. After I have done a ZMSCustom "shop" which contain 0..n 
"articles".  I can normally add a shop object and add some "article" 
object in the shop ( id_prefix = 'article' ). A little problem occurs 
when I activate the workflow : I can not do "request commit". Well I see 
the changes in "Aufgaben" but I can't commit...
  Must I change the workflow.xml or something else?

Best regards.
Jean Tinguely Awais.

begin:vcard
fn:Jean Tinguely Awais
n:Tinguely Awais;Jean
org:Artification AG;Web
adr:;;Hubelweg 5;Herzogenbuchsee;;3360;Switzerland
email;internet:[email protected]
title:Associate
tel;work:062/961.07.07
url:http://www.artification.com
version:2.1
end:vcard