Cost types are used to provide a breakup of the cost absorbed suitably as
- Basic
- Installation
- Royalty
- Inspection etc..
This cost addition in certain cases (Imported items) normally occurs over a period of time and so cost of the asset / depreciation is suitably worked based on point in time when the cost is incurred
This breakup is also useful for reporting purposes.
Maintenance Repair costs also can be maintained as a breakup using the Repair cost type.
Cost types can have both a positive as well as a negative value and hence would be useful when you need to represent IMPAIRMENT of Assets (AS28)