Amortization schedule in AR

I am looking for amortization schedule in AR.Please let me know if you have come across a utility in AR.

I have a client that has offerred installments on overdue delinquent recivable.
They want to calculate interest on daily basis.
On receiving early payment of the installment the customer will pay interest on lower net balance.
On a late payment , customer will pay interest on the balance till the payment was received.

Principal balance $2000

Ten Installments $200 each due every 1 st of the month

Amortization will lokk like:

Principal	2000
Payment Date	Payment	Principal Applied	Interest aapplied	Principal balance
1/1/2011	200	196	4	1804
1/23/2011	200	197	3	1607
3/7/2011	200	195	5	1412