I need to loop over a subset of ZCataloged ZClass instances, change a property, and reindex the ZClass. A simple approach fails: for i in context.Catalog_Org(userid=uid): l=i.userid l.remove(uid) rid=i.data_record_id_ obj=context.Catalog_Org.getobject(rid) obj.propertysheets.data.manage_changeProperties(userid=l) obj.reindex_object() The above Python Script will change only one ZClass instance, no matter how many exist, because when "obj.reindex_object()" is reached, it causes the loop to end immediately. A data_record_id caching makes the script work: rids=[] for i in context.Catalog_Org(userid=uid): l=i.userid l.remove(uid) rid=i.data_record_id_ rids.append(rid) obj=context.Catalog_Org.getobject(rid) obj.propertysheets.data.manage_changeProperties(userid=l) for rid in rids: obj=context.Catalog_Org.getobject(rid) obj.reindex_object() Is it a bug or feature? I run Zope 2.4.3 on Linux. -- Milos Prudek