General journal insert tax exempt number when account type is Ledger

Hi all,

I am new in finance in AX and I am interested in the process of the work in general journal. I know it is not possible to add tax exempt number for account type Ledger in general journal, but I don’t understand why. Can someone explain me if it is a possible if I have account type ledger and I need to add tax exempt number how I can do that, is there some other way for doing this?