This functionality is primarily designed for the Australian National Consumer Credit Protection (NCCP) Act Comparison Rate requirements.
The new functionality applies to Fixed Term Loans.
On the Account Type form, Interest Options page there is a section that allows you to set the Comparison Rate options. These include the Type, the digits to round to and the Maximum Rate. In Australia set to "Australian NCCP", 2 and 48%.
Elements; Advance, Deposit and Refinance types are always treated as Capitalised Principal. However, for Cost, Fee and Journal types you can define whether or not the element is capitalised to Principal. Normally this only applies to government fees. Additionally if capitalising, you can define the Regions (or States in Australia), this applies to, for example a fee could apply to only NSW.
There is a optional script that is defined under Account Types. The Script should be an "Object Event" for object "Account" and should handle the "CalculateComparisonRate" event.