addresses_cck: cannot leave default values empty when editing a field

I added an addresses field via cck to new node type. When I wanted to edit it later under admin/content/node-type/lokal/fields/field_address I always get

* Das Feld City wird benötigt.
* Das Feld Street wird benötigt.
* Das Feld Postal code wird benötigt.
* Der Standardwert ist ungültig.

So it says City, Street, and Postal code are mandatory and the default value is invalid.

I think it should very well be possible to leave those textfields empty, just like "state/provence" and "additional".