General Item category Group is basically determine business 
function of the material which is to be proceed in sales 
document e.g General item category Group can be Norm for 
services whichs indicate that this service is normal 
service for the organisation but Item Category Group must 
be LIES which is indicate the item is service with 
delivery. Item category Group also used to determine the 
Item category in sales document with the help of Item Usage 
and Higher Level item category.