Rate Category no longer in use
A Rate Category say X should no longer be used for billing as from 01 January 2011.
I have changed its Facts, Rate Determination and Price valid to to 31.12.2010.
But when I change the rate category of an installation as at say 01.03.2011 to X, no error messages appears. The change is saved.
How can I make the Rate Category no longer valid?
Thanks for a reply