Multi level depreciation - config. of key

Hi

I am going to configure method of depreciation fulfilling this assumptions: different stated percentage rate in each consecutive year of ten; the sum of yearly rates equal to 100, equal monthly amounts of depreciation during a given year.

I think that the best solutions will be multi u2013 level depreciation. I know that firstly I have to define multi-level method and then assign it to the depreciation key. In the definition of keys existing in my system there are also assignment to base method, declining-balance methods, period control methods and changeover method. How does it work together. What assignment should I make in the key for multi - level deprec. concerning base method.

(ECC 6.0)

Hubert