JD Edwards Contract Amortization - calculation basis change during life of contract

Hi,

We are looking to start using multi-year service contracts and are currently testing this, with some odd/unexpected results. For example, we have a monthly billed 2 year contract (so Billable Duration 24 months) billing $100 per month, with Contract Header Start/End Dates as 15/08/22 to 14/08/24 and the same dates for Contract Detail Start/End.

The billing process seems to work perfectly and bills $100 each month for the 24 months of the contract. However, the monthly amortization figures are odd.

When we run the R17321 Amortization Workfile Generation program (standard/unmodified) monthly for the months Sep-22 through Mar-23 the amortization amount each month is the number of days x daily amortization amount - this is as expected. But when we then run R17321 for Apr-23 which is in our new FY (starting 1st April) the monthly amortization is 1/12th of the annual amount (i.e. $100 exactly, which equates to 30.4 days approx). This then continues for the duration of the contract, amortizing 1/12th each month.