Which settings can be made for account assignment categories？ There are 2 correct answers to this question.（)

A.The field selection for all fields of the purchase order header can be defined based on the account assignment category

B.The field selection for all fields of a purchase order item can be defined based on the account assignment category

C.New account assignment categories can be created in customizing

D.The field selection for the account assignment fields of a purchase order item can be defined based on the account assignment category