[Zope] Difference between manage_addProperty on a DTMLDocument and on a Folder ? Folder ?

[Benillouche, Michael]

I have the following problem :

When I execute this code :

<dtml-call "REQUEST.set('compteur_login', _.str(compteur) )"> 
<dtml-call "manage_addFolder(id=compteur_login)">
<dtml-call "_[compteur_login].manage_addProperty('type', 'FC', 'string')">

The Folder  is created  with the property 'type'

But when I execute this code :

<dtml-call "REQUEST.set('compteur_login', _.str(compteur) )"> 
<dtml-call "manage_addDTMLDocument(id=compteur_login)">
<dtml-call "_[compteur_login].manage_addProperty('type', 'FC', 'string')">

I have the following error :

Error Type: AttributeError
Error Value: 'string' object has no attribute 'manage_addProperty'

It seems that manage_addProperty doesn't behave the same way on a Folder and
a DTMLDocument .
Any solution to make it work ?
Thanks a lot.
Michael