AjaxSelectWidget in Crud form

[Martronic-SA]

I have a Crud form /@@DaTa that lists some content in the portal and shows the data as editable fields.
There is a problem when getting the relations vocabulary of a Select field for an item displayed in the crud table.

The vocab is taken from the data-pat-relateditems attribute, vocabularyUrl. sample:
data-pat-relateditems='{"vocabularyUrl": "http://xxxxxxxxxxx/dexterity-types/group/@@data/++widget++crud-edit.10.widgets.people/@@getSource", "searchText": "Search", "folderTypes": ["Folder"], "homeText": "Home", "basePath": "/xxxxxxx", "sort_on": "sortable_title", "rootPath": "/xxxxx", "sort_order": "ascending", "separator": ";", "treeVocabularyUrl": "http://xxxxxxxx/@@getVocabulary?name=plone.app.vocabularies.Catalog", "searchAllText": "Entire site"}'
but the vocabularyUrl is constructed with the main form URL (request.getURL()) and not with the item URL (the context is wrong)

        if field and getattr(field, 'vocabulary', None):
            form_url = self.request.getURL()
            source_url = "%s/++widget++%s/@@getSource" % (form_url, self.name)
            args['pattern_options']['vocabularyUrl'] = source_url