[Zope] Zope factory uses the file name not the instance method

[Max M]

I have two versions of an manage_addSomeForm.

# zmi version
manage_addTopicForm = PageTemplateFile('zpt/Topic_manage_addTopicForm', 
globals())

# edit version
manage_addTopic = PageTemplateFile('zpt/Topic_manage_addTopic', globals())


The zmi version worked nicely. The product gets added etc. But the edit 
version, which is for the custom editing interface, did NOT work when I 
called it from a form:

<input type="submit"
name="/manage_addProduct/ots_Forum/manage_addTopic:method"
class="button" tal:attributes="value i18n/new">


But if I call it with the filename of the Page Template instead, I get 
the behaviour I want.

<input type="submit"
name="/manage_addProduct/ots_Forum/Topic_manage_addTopic:method"
class="button" tal:attributes="value i18n/new">


It is defined correctly in the constructors:

constructors = (manage_addTopicForm, manage_addTopicAction, 
manage_addTopic, )


Does anybody know why it has this behaviour?

Zope never ceases to surprise me ...


regards Max M