Phase out settings at a higher level such as brand or major customer

Have any of you ever setup phase out assignments at a higher level than product and had it work correctly?  For example, we want to phase out a brand for a major customer.  In other words, a customer is dropping a brand and we don't want statistical forecast generated for that brand customer combination any longer.  I am able to setup the fields in phase out lifecycle settings for product, brand, major account but when i enter the brand and major account I am still getting forecast generated.  It appears to stop for some products within the brand but not all.  Another example is if a customer quits ordering from us I want to setup the major customer to phase out so no forecast is generated.

If you have done this successfully please let me know.  Or if you would handle these situations in a different manner other than phase out please let me know.  We can do historical adjustments each period but that is a lot of maintenance to do after each period before statistical forecast is generated.

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Thanks

Steve