Significance of HR locations in iExpenses

Hi Guru's,

Can anyone please tell me the relationship between HR locations and iExpenses. Locations are used in iExpenses for the following :

1. Per diem calculation be based on locations

2. Mileage policy schedule can be based on locations

3. Audit rules like always audit can be set based on locations.

4. Credit card statement loader program considers locations

5. While exporting the expense report to AP employee address is based on locations.

Is there any other significance.

Thanks,
Satish