Hi Ramesh
Both these storage types roles are used in automated warehouse. If warehouse is having automated storage area and conveyor belts we have to map the storage type with above mentioned roles.
Example storage area role - J
Retrieval/ Conveyors - H
whenever we have the WO from these area we will get MFS as the warehouse order creation rule.
I hope you are clear.
let me know if you have more query.
Regards
Jobi