Change storage dimension on products.

We have loaded products and released products using a storage dimension that did not have financial inventory down to the warehouse level.  Now the users have decided that it should be active at the warehouse level.  I created a new storage dimension group with the required values, but I cannot change the storage dimension group.  There are no transactions against any items, but the storage dimension is unavailable.  I tried to reload the items with the new storage dimension using DIXF, but it fails as well.  I would have thought that the values could be changed, and maybe I'm just doing something wrong.  Is there a way of changing the storage dimension without deleting all the items?