[Product-Developers] Crash while moving folder contents

[Maarten Nieber]

Hi,

I need to replace a document that has content type Section with another 
document that has content type SectionMarketing. My approach is to simply move
the folder contents from the old instance to the new instance, using these 
lines:

            ids = [item.id for item in section.listFolderContents()]
            section.manage_cutObjects(ids)
            marketingsection.manage_pasteObjects()

and then replace the old instance with the new instance in my tree structure.
The call to manage_pasteObjects triggers an error: "No clipboard data found." 
(packed inside an HTML formatted error message). 

Can somebody point out what I'm doing wrong?
Thanks!
Maarten


ps My entire upgrade function is

def upgrade_16_to_17b(setup):
    catalog = getToolByName(setup, 'portal_catalog')
    brains = catalog(object_provides=IMarketingContainer.__identifier__)

    for brain in brains:
        container = brain.getObject()
        sections = container.listFolderContents()
        for section in sections:
            id = section.id + '_marketing'
            container.invokeFactory('abb.types.sectionmarketing', id, 
title=section.title + '_marketing')
            marketingsection = container[id]
            ids = [item.id for item in section.listFolderContents()]
            section.manage_cutObjects(ids)
            marketingsection.manage_pasteObjects()
            container.manage_delObjects(section.id)