I use external methods to set properties that are objects for my Dataskins. I have a Customer Dataskin with a property Address, that is another Dataskin. In my editInstance for Customer I change the properties of Address directly: <dtml-call "propertysheets.basic.manage_changeProperties(REQUEST=REQUEST)"> <dtml-call "Address.propertysheets.basic.manage_changeProperties(REQUEST=REQUEST)"> but this results into a keyError afters a couple of edits. When I get the Address directly from the Rack it works fine: <dtml-let addr="Contacts.addressRack.getItem(id)"> <dtml-call "addr.propertysheets.basic.manage_changeProperties(REQUEST=REQUEST)"> </dtml-let> Why does the "simple" way of doing not work consistently? Is this a bug, maybe? Roché