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.