How I could modify the tx as01

Hi,

First I don´t know if it is possible, but I am trying to modify something in the AS01 transaction. When I am going to create a new fixed asset, when I put the value of the "DIVISION", I would want that the "COST CENTER" will be filled automatically. I pretend to modify the standard for this, but I don´t know where I can do it.

Could somebody help me? I have been searching USER EXITS for this, but I couldn´t find any.

Thanks for your time.