works fine under version 2.1 of alfresco (it returns the list of the nodes corresponding to the categories of the document) but returns null in alfresco 2.9B.
Has this bug already been discovered or did I make something wrong …
I don't think this should have changed. However, null, invalid noderefs and invalid categories will be filtered from properties of type d:category. It is possible the categories referenced do not exists or are not of type cm:category.