How to change the logic of amount in words?

Hi all,

One of our customer is getting the total as 31,500,000 and when I used the check report to display the amount in words, it is printing as three billion fifteen million rupiah and this currency is in Indonesia rupiah.But the customer wants to print as thirty one million five hundred thousand rupiah. How to change this logic in check report to get the amount in words printed as the above.

Thanks in advance.

Regards,
chandru.