Scenario: You have selected a file-based interest rate for debit balances, and that file also specifies the rates applicable to credit balances.
If you are calculating interest on a series of transactions involving at least one credit balance, you will normally be offered the option to specify the interest rate to be applied on the credit balances.
However, in this scenario you will not be given that option, because the credit rates specified in the first file will always be used.
If in fact you do need to use different rates on the credit balances then you have these choices.
Firstly, you can open the file specified for debit rates and untick the "Preset Interest Rate on Credit Balances" box. The credit rates will then be ignored and you will again be offered the chance to define the credit rates. The only drawback with this approach is that you must remember to return the file to its original state by going back and ticking the box again when finished.
Alternatively you can create a new interest rate file. Save the first file using a different name. You can the change the credit interest rate settings to the ones you need.