what is the difference between transaction code FD01, and XD01 and VD01
XD01 - Create customer centrally. General Data, Comp Code Data and Sales Area Data are accessible.
FD01 - FI View of the customer master. Here you can access only General Data and Comp Code Data.
VD01 - Sales VIew of the Customer Master. Here you can access only Gen Data and Sales Area Data.