Why Do We Assign Division to Sales Organisation

In SAP, why do we assign division to Sales organisation not to distribution channel?

  In SAP Business Process  
    
  Sales Area= Sales Org.+Dist.Channel+Division. 
    
  Its Triangular intraction 
    
                          Sales organization 
                               /                 \ 
                             /                     \ 
     Dist.Channel<----------------->Division 
    
Sales Org controls Distribution Channel and Division 
    
Distribution Channel: The channel that is choosen the organization to make their product reach the end customer.(Network) 
    
Division: Ex: HLL-------->  Detergents, Out of Home,Food Products,Health Care Sectors/Departments  
              TATA Motars: Trucks/Bus,Cars,Heavy Vechiles Etc... 
    
Please note it is not: 
    
    Sales organization 
            | 
            |             
    Dist.Channel 
            | 
            | 
      Division

Division is an Oragaizational Unit. 
    
The Division in the Material Master is not an Organizational Unit that can be used to maintain related fields.  It is a field which is used to uniquely assign a material to a Division.